CBSE Political Science Sample Papers and Syllabus for Class 12th

CBSE 10th Date sheet 2021 CBSE 12th Date Sheet 2021

Section A

Section – A consists of 24 questions. Attempt any 20 questions from this section. The first attempted 20 questions would be evaluated.

1. The structure of bilobed anther consists of

2 thecae, 2 sporangia
4 thecae, 4 sporangia
4 thecae, 2 sporangia
2 thecae, 4 sporangia

The correct answer is 2 thecae, 4 sporangia

2. In the figure of anatropous ovule given below, choose the correct option for the characteristic distribution of cells within the typical embryo sac

	Number of cells at chalazal end	Number of cells at micropylar end	Number of nuclei left in central cell
A	3	2	3
B	3	3	2
C	2	3	3
D	2	2	4

The correct answer is B. 3,3,2

3. The coconut water from tender coconut is

cellular endosperm.
free nuclear endosperm.
both cellular and nuclear endosperm.
free nuclear embryo.

The correct answer is free nuclear endosperm.

4. Pollen grains are well preserved as fossils because of presence of

sporopollenin
cellulose
lignocellulose
pectocellulose

The correct answer is sporopollenin

5. Which of the following statements are true related to Seed X and Y?

Seed X is dicot and endospermic or albuminous.
Seed X is dicot and non-endospermic or non-albuminous.
Seed Y is monocot and endospermic or albuminous.
Seed Y is monocot and non-endospermic or non-albuminous.

Choose the correct option with the respect to the nature of the seed

(i), (iii)
(ii), (iii)
(i), (iv)
(ii), (iv)

The correct answer is (ii), (iii)

6. Which of the following statements are correct with respect to hormones secreted by placenta?

Placenta secretes relaxin during later stage of pregnancy.
Placenta secretes high amount of FSH during pregnancy.
Placenta secretes relaxin during initial stage of pregnancy.
Placenta secretes hCG and hPL during pregnancy.

(i) and (iv)
(i), (ii) and (iv)
(iii) and (iv)
(ii), (iii) and (iv)

The correct answer is (i) and (iv)

7. (i) and (iv)

Figure A

Figure B.

Identify the correct stage of development of human embryo (Figure B) that takes place at the site X, Y and Z respectively in the human female reproductive system (Figure A).
Choose the correct option from the table below:

	X	Y	Z
A	Morula	Fertilized egg	Blastocyst
B	Unfertilized egg	Fertilized egg	Morula
C	Blastocyst	Fertilized egg	Unfertilized egg
D	Fertilized egg	Morula	Blastocyst

The correct answer is C. blastocyst, Fertilized egg, Unfertilized egg

8. Penetration of the sperm in the ovum is followed by

formation of first polar body.
completion of meiosis II.
first meiosis.
dissolution of zona pellucida.

The correct answer is completion of meiosis II.

9. The correct sequence of hormone secretion from beginning of menstruation is

FSH, progesterone, estrogen.
estrogen, FSH, progesterone.
FSH, estrogen, progesterone.
estrogen, progesterone, FSH.

The correct answer is FSH, estrogen, progesterone.

10. In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:

	Size of the flower	Colour of flower	Characteristic feature of pollengrain
A	small	brightly coloured	Light weight and non-sticky
B	large	colourless	large and sticky
C	small	white	small, covered with mucilage
D	large	colourless	non sticky

The correct answer is C. small, White, Small, covered with mucilage

11. The thalamus contributes to the fruit formation in

banana.
orange.
strawberry.
guava.

The correct answer is strawberry.

12. How many types of gametes would be produced if the genotype of a parent is AaBB?

1
2
3
4

The correct answer is 2.

13. Which of the following statements indicates parallelism in genes and chromosomes?

They occur in pairs
They segregate during gamete formation
They show linkage
Independent pairs segregate independently

(i) and (iii)
(ii) and (iii)
(i), (ii) and (iii)
(i), (ii) and (iv)

The correct answer is (i), (ii) and (iv)

14. Which of the following amino acid substitution is responsible for causing sickle cell anemia?

Valine is substituted by Glutamic acid in the α globin chain at the sixth position
Valine is substituted by Glutamic acid in the β globin chain at seventh position
Glutamic acid is substituted by Valine in the α globin chain at the sixth position
Glutamic acid is substituted by Valine in the β globin chain at the sixth position

The correct answer is Glutamic acid is substituted by Valine in the β globin chain at the sixth position

15. In human beings, where genotype AABBCC represents dark skin colour, aabbcc represents light skin colour and AaBbCc represents intermediate skin colour; the pattern of genetic inheritance can be termed as:

Pleiotropy and codominance
Pleiotropy and incomplete dominance
Polygenic and qualitative inheritance
Polygenic and quantitative inheritance

The correct answer is Polygenic and quantitative inheritance

16. Which of the following combination of chromosome numbers represents the correct sex determination pattern in honey bees?

Male 32, Female 16
Male 16, Female 32
Male 31, Female 32
Female 32, Male 31

The correct answer is Male 16, Female 32

17. Rajesh and Mahesh have defective haemoglobin due to genetic disorders. Rajesh has too few globin molecules while Mahesh has incorrectly functioning globin molecules.Identify the disorder they are suffering from.

The correct answer is B

18. Which of the following criteria must a molecule fulfil to act as a genetic material?

It should not be able to generate its replica
It should chemically and structurally be stable
It should not allow slow mutation
It should be able to express itself in the form of Mendelian Characters

(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(ii) and (iv)

The correct answer is (ii) and (iv)

19. The promoter site and the terminator site for transcription are located at

3′ (downstream) end and 5′ (upstream) end, respectively of the transcription unit
5′ (upstream) end and 3′ (downstream) end, respectively of the transcription unit
the 5′ (upstream) end of the transcription unit
the 3′ (downstream) end of the transcription unit

The correct answer is 5′ (upstream) end and 3′ (downstream) end, respectively of the transcription unit

20. Which of the following is correct about mature RNA in eukaryotes?

Exons and introns do not appear in the mature RNA.
Exons appear, but introns do not appear in the mature RNA.
Introns appear, but exons do not appear in the mature RNA.
Both exons and introns appear in the mature RNA.

The correct answer is Exons appear, but introns do not appear in the mature RNA.

21. In E.coli, the lac operon gets switched on when

lactose is present and it binds to the repressor.
repressor binds to operator.
RNA polymerase binds to the operator.
lactose is present and it binds to RNA polymerase.

The correct answer is lactose is present and it binds to the repressor.

22. Oswald Avery, Colin MacLeod and Maclyn McCarty used enzymes to purify biochemicals such as proteins, DNA and RNA from the heat-killed S cells to see which ones could transform live R cells into S cells in Griffith's experiment. They observed that

Proteases and RNases affected transformation.
DNase inhibited transformation.
Proteases and Lipases affected transformation.
RNases inhibited transformation.

The correct answer is DNase inhibited transformation.

23. AUG on the mRNA will result in the activation of which of the following RNA having correct combination of amino acids:

	Site A	Site B
A	UAC	Methionine
B	Methionine	UAC
C	Methionine	AUG
D	AUG	Methionine

The correct answer is Methionine, UAC

24. Short stretches of DNA used to identify complementary sequence in a sample arecalled

probes
markers
VNTRs
primers

The correct answer is probes

SECTION B

Section - B consists of 24 questions (Sl. No.25 to 48). Attempt any 20 questions fromthis section. The first attempted 20 questions would be evaluated.

Question No. 25 to 28 consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

Both A and R are true and R is the correct explanation of A
Both A and R are true and R is not the correct explanation of A
A is true but R is false
A is False but R is true

25. Assertion: Lactational amenorrhea is the natural method of contraception.
Reason: It increases the phagocytosis of sperm.

The correct answer is A is true but R is false

26. Assertion: Saheli, an oral contraceptive for females, contains a steroidal preparation.
Reason: It is a "once a week" pill with very few side effects.

The correct answer is A is False but R is true.

27. Assertion: Parturition is induced by a complex neuro endocrine meachanism.
Reason: At the end of gestation period, the maternal pituitary releases prolactin which causes uterine contractions.

The correct answer is A is true but R is False.

28. Assertion: When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than nonparental type.
Reason: Higher parental gene combinations can be attributed to crossing over between two genes.

The correct answer is A is true but R is false

29. Concentration of which of the following substances will decrease in the maternal blood as it flows from embryo to placenta through the umbilical cord?

Oxygen
Amino Acids
Carbon dioxide
Urea

i and ii
ii and iv
iii and iv
i and iv

The correct answer is i and ii

30. In a fertilized ovule, n, 2n and 3n conditions occur respectively in

antipodal, zygote and endosperm
zygote, nucellus and endosperm
endosperm, nucellus and zygote.
antipodals, synergids and integusments

The correct answer is antipodal, zygote and endosperm

31. A botanist studying Viola (common pansy) noticed that one of the two flower types withered and developed no further due to some unfavorable condition, but the other flower type on the same plant survived and it resulted in an assured seed set. Which of the following will be correct?

The flower type which survived is Cleistogamous and it always exhibits autogamy
The flower type which survived is Chasmogamous and it always exhibits geitonogamy.
The flower type which survived is Cleistogamous and it exhibits both autogamy and geitonogamy.
The flower type which survived is Chasmogamous and it never exhibits autogamy

The correct answer is The flower type which survived is Cleistogamous and it always exhibits autogamy

32. During parturition, a pregnant woman is having prolonged labour pains and child birth has to be fastened. It is advisable to administer a hormone that can

increase the metabolic rate.
release glucose in the blood.
stimulate the ovary.
activate smooth muscles

The correct answer is activate smooth muscles

33. A female undergoing IVF treatment has blocked fallopian tubes. The technique by which the embryo with more than 8 blastomeres will be transferred into the female for further development is

ZIFT
GIFT
IUT
AI

The correct answer is IUT

34. The mode of action of the copper ions in an IUD is to

increase the movement of sperms.
decrease the movement of the sperms.
make the uterus unsuitable for implantation.
make the cervix hostile to the sperms.

The correct answer is decrease the movement of the sperms.

35. To produce 400 seeds, the number of meiotic divisions required will be

400
200
500
800

The correct answer is 500

36. A cross is made between tall pea plants having green pods and dwarf pea plants having yellow pods. In the F2 generation, out of 80 plants how many are likely to be tallplants?

15
20
45
60

The correct answer is 60

37. In Antirrhinum, RR is phenotypically red flowers, rr is white and Rr is pink. Select the correct phenotypic ratio in F1 generation when a cross is performed between RR X Rr:

1 red: 2 Pink: 1 white
2 Pink: 1 white
2 Red: 2 Pink
All Pink

The correct answer is 2 Red: 2 Pink

38. What would be the genotype of the parents if the offspring have the phenotypes in 1:1 proportion?

Aa X Aa
AA X AA
Aa X AA
Aa x aa

The correct answer is Aa x aa

39. What is the pattern of inheritance in the above pedigree chart?

Autosomal dominant
Autosomal recessive
Sex -linked dominant
Sex -linked recessive

The correct answer is Autosomal recessive

40. A couple has two daughters. What is the probability that the third child will also be a female?

25%
50%
75%
100%

The correct answer is 50%

41. Genotypic ratio of 1:2:1 is obtained in a cross between

AB X AB
Ab X Ab
Ab X ab
ab X ab

The correct answer is Ab X Ab

42. Total number of nucleotide sequences of DNA that codes for a hormone is 1530. The proportion of different bases in the sequence is found to be Adenine = 34%, Guanine = 19%, Cytosine = 23%, Thymine = 19%.

Applying Chargaff’s rule, what conclusion can be drawn?

It is a double stranded circular DNA.
It is a single stranded DNA.
It is a double stranded linear DNA.
It is a single stranded DNA coiled on Histones.

The correct answer is It is a single stranded DNA.

43. A stretch of an euchromatin has 200 nucleosomes. How many bp will there be in the stretch and what would be the length of the typical euchromatin?

20,000 bp and 13,000 x10-9 m
10,000 bp and 10,000 x10-9 m
40,000 bp and 13,600 x10-9 m
40,000 bp and 13,900 x10-9 m

The correct answer is 40,000 bp and 13,600 x10-9 m

44. Observe structures A and B given below. Which of the following statements are correct?

A is having 2'-OH group which makes it less reactive and structurally stable, whereas B is having 2'-H group which makes it more reactive and unstable.
A is having 2'-OH group which makes it more reactive and structurally unstable, whereas B is having 2'-H group which makes it less reactive and structurally stable.
A and B both have -OH groups which make it more reactive and structurally stable.
A and B both are having -OH groups which make it less reactive and structurally stable

The correct answer is A is having 2'-OH group which makes it more reactive and structurally unstable, whereas B is having 2'-H group which makes it less reactive and structurally stable.

45. If Meselson and Stahl's experiment is continued for sixth generations in bacteria, the ratio of Heavy strands 15N/15N :Hybrid15N/14N : light 14N/14N containing DNA in the sixth generation would be

1:1:1
B. 0:1:7
0:1:15
0:1:31

The correct answer is 0:1:31

46. Two important RNA processing events lead to specialized end sequences in most human mRNAs: (i) at the 5’ end, and (ii) at the 3’ end. At the 5’end the most distinctive specialized end nucleotide, (iii) is added and a sequence of about 200 (iv) is added to the 3’ end.

(i) Initiator codon (ii) Promotor (iii) Terminator codon (iv) Release factors
(i). Promotor (ii) Elongation (iii) Regulation (iv) Termination.
(i) Capping (ii) Polyadenylation (iii) mGppp (iv) Poly(A).
(i) Repressor (ii) Co repressor (iii) Operon (iv) sRelease factors

The correct answer is (i) Capping (ii) Polyadenylation (iii) mGppp (iv) Poly(A).

47. What are minisatellites?

10-40 bp sized small sequences within the genes
Short coding repetitive region on the eukaryotic genome
Short non-coding repetitive sequence forming large portion of eukaryotic genome
Regions of coding strands of the DNA

The correct answer is Short non-coding repetitive sequence forming large portion of eukaryotic genome

48. There was a mix-up at the hospital after a fire accident in the nursery division. Which of these children belong to the parents?

All of the children
Children 2, 3 & 6
Children 1 & 3
Children 2 & 4

The correct answer is Children 1 & 3

SECTION C

Section-C consists of one case followed by 6 questions linked to this case (Q.No.49 to 54). Besides this, 6 more questions are given. Attempt any 10 questions in this section. The first attempted 10 questions would be evaluated.

Case

To answer the questions, study the graphs below for Subject 1 and 2 showingdifferent levels of certain hormones.

49. The peak observed in Subject 1 and 2 is due to

estrogen
progesterone
luteinizing hormone
follicle stimulating hormone

The correct answer is luteinizing hormone

50. Subject 2 has higher level of hormone B, which is

estrogen
progesterone
luteinizing hormone
follicle stimulating hormone

The correct answer is progesterone

51. If the peak of Hormone A does not appear in the study for Subject 1, which of the following statement is true?

Peak of Hormone B will be observed at a higher point in the graph
Peak of Hormone B will be observed at a point lower than what is given in the graph
There will be no observed data for Hormone B
The graph for Hormone B will be a sharp rise followed by a plateau

The correct answer is There will be no observed data for Hormone B

52. Which structure in the ovary will remain functional in subject 2?

Corpus Luteum
Tertiary follicle
Graafian follicle
Primary follicle

The correct answer is Corpus Luteum

53. For subject 2 it is observed that the peak for hormone B has reached the plateau stage. After approximately how much time will the curve for hormone B descend?

28 days
42 days
180 days
280 days

The correct answer is 280 days

54. Which of the following statements is true about the subjects?

Subject 1 is pregnant
Subject 2 is pregnant
Both subject 1 and 2 are pregnant
Both subject 1 and 2 are not pregnant

The correct answer is Subject 2 is pregnant

55. The gene that controls the ABO blood group system in human beings has three alleles -IA, IBand i. A child has blood group O. His father has blood group A and mother has blood group B. Genotypes of other off springs can be:

.IBIB
.IAi
.IBi
.IAIB
ii

i, ii, iii, v
ii, iii ,iv, v
iii, iv, v
iv, iii, i

The correct answer is ii, iii ,iv, v

56. Placed below is a karyotype of a human being..

On the basis of this karyotype, which of the following conclusions can be drawn:

Normal human female
Person is suffering from Colour Blindness
Affected individual is a female with Down’s syndrome
Affected individual is a female with Turner’s syndrome

The correct answer is Affected individual is a female with Down’s syndrome

57. Given below is a dihybrid cross performed on Drosophila.

Which of the following conclusions can be drawn on the basis of this cross? When yellow bodied (y), white eyed (w) Drosophila females were hybridized with brown bodied (y+), red eyed males (w+) and F1 progenies were intercrossed, F2 generation would have shown the following ratio:

1:2:1 because of linkage of genes
9:3:3:1 because of recombination of genes
Deviation from 9:3:3:1 ratio because of segregation of genes
Deviation from 9:3:3:1 ratio because of linkage of genes

The correct answer is Deviation from 9:3:3:1 ratio because of linkage of genes

58. Which cellular process is shown below?

DNA Replication
Translation - Initiation
Translation - Elongation
Translation – Termination

The correct answer is Translation - Elongation

59. Origin of replication of DNA in E. coli is shown below, Identify the labelled parts (i),(ii), (iii) and (iv)

(i)- discontinuous synthesis , (ii)- continuous synthesis (iii) 3’ end (iv) 5’end
(i)- continuous synthesis , (ii)- discontinuous synthesis (iii) 5’ end (iv) 3’end
(i)- discontinuous synthesis, (ii)- continuous synthesis (iii) 5’ end (iv) 3’end
(i)- continuous synthesis , (ii)- discontinuous synthesis (iii) 3’ end (iv) 5’end

The correct answer is (i)- continuous synthesis , (ii)- discontinuous synthesis (iii) 3’ end (iv) 5’end

60. Transcription unit is represented in the diagram given below.

Identify site (i), factor (ii) and Enzyme (iii) responsible for carrying out the process.

(i) Promoter Site, (ii) Rho factor (iii) RNA polymerase
(i) Terminator Site, (ii) Sigma factor (iii) RNA polymerase
(i) Promoter Site, (ii) Sigma factor (iii) RNA polymerase
(i) Promoter Site, (ii) Sigma factor (iii) DNA polymerase

The correct answer is (i) Promoter Site, (ii) Sigma factor (iii) RNA polymerase.

Related Exam

Last Updated on : August 27, 2025

CBSE Political Science Sample Papers and Syllabus for Class 12th

1. The structure of bilobed anther consists of

The correct answer is 2 thecae, 4 sporangia

2. In the figure of anatropous ovule given below, choose the correct option for the characteristic distribution of cells within the typical embryo sac

The correct answer is B. 3,3,2

3. The coconut water from tender coconut is

The correct answer is free nuclear endosperm.

4. Pollen grains are well preserved as fossils because of presence of

The correct answer is sporopollenin

5. Which of the following statements are true related to Seed X and Y?

The correct answer is (ii), (iii)

6. Which of the following statements are correct with respect to hormones secreted by placenta?

The correct answer is (i) and (iv)

7. (i) and (iv)

The correct answer is C. blastocyst, Fertilized egg, Unfertilized egg

8. Penetration of the sperm in the ovum is followed by

The correct answer is completion of meiosis II.

9. The correct sequence of hormone secretion from beginning of menstruation is

The correct answer is FSH, estrogen, progesterone.

10. In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:

The correct answer is C. small, White, Small, covered with mucilage

11. The thalamus contributes to the fruit formation in

The correct answer is strawberry.

12. How many types of gametes would be produced if the genotype of a parent is AaBB?

The correct answer is 2.

13. Which of the following statements indicates parallelism in genes and chromosomes?

The correct answer is (i), (ii) and (iv)

14. Which of the following amino acid substitution is responsible for causing sickle cell anemia?

The correct answer is Glutamic acid is substituted by Valine in the β globin chain at the sixth position

15. In human beings, where genotype AABBCC represents dark skin colour, aabbcc represents light skin colour and AaBbCc represents intermediate skin colour; the pattern of genetic inheritance can be termed as:

The correct answer is Polygenic and quantitative inheritance

16. Which of the following combination of chromosome numbers represents the correct sex determination pattern in honey bees?

The correct answer is Male 16, Female 32

17. Rajesh and Mahesh have defective haemoglobin due to genetic disorders. Rajesh has too few globin molecules while Mahesh has incorrectly functioning globin molecules.Identify the disorder they are suffering from.

The correct answer is B

18. Which of the following criteria must a molecule fulfil to act as a genetic material?

The correct answer is (ii) and (iv)

19. The promoter site and the terminator site for transcription are located at

The correct answer is 5′ (upstream) end and 3′ (downstream) end, respectively of the transcription unit

20. Which of the following is correct about mature RNA in eukaryotes?

The correct answer is Exons appear, but introns do not appear in the mature RNA.

21. In E.coli, the lac operon gets switched on when

The correct answer is lactose is present and it binds to the repressor.

22. Oswald Avery, Colin MacLeod and Maclyn McCarty used enzymes to purify biochemicals such as proteins, DNA and RNA from the heat-killed S cells to see which ones could transform live R cells into S cells in Griffith's experiment. They observed that

The correct answer is DNase inhibited transformation.

23. AUG on the mRNA will result in the activation of which of the following RNA having correct combination of amino acids:

The correct answer is Methionine, UAC

24. Short stretches of DNA used to identify complementary sequence in a sample arecalled

The correct answer is probes

25. Assertion: Lactational amenorrhea is the natural method of contraception. Reason: It increases the phagocytosis of sperm.

The correct answer is A is true but R is false

26. Assertion: Saheli, an oral contraceptive for females, contains a steroidal preparation. Reason: It is a "once a week" pill with very few side effects.

The correct answer is A is False but R is true.

27. Assertion: Parturition is induced by a complex neuro endocrine meachanism. Reason: At the end of gestation period, the maternal pituitary releases prolactin which causes uterine contractions.

The correct answer is A is true but R is False.

28. Assertion: When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than nonparental type. Reason: Higher parental gene combinations can be attributed to crossing over between two genes.

The correct answer is A is true but R is false

29. Concentration of which of the following substances will decrease in the maternal blood as it flows from embryo to placenta through the umbilical cord?

The correct answer is i and ii

30. In a fertilized ovule, n, 2n and 3n conditions occur respectively in

The correct answer is antipodal, zygote and endosperm

31. A botanist studying Viola (common pansy) noticed that one of the two flower types withered and developed no further due to some unfavorable condition, but the other flower type on the same plant survived and it resulted in an assured seed set. Which of the following will be correct?

The correct answer is The flower type which survived is Cleistogamous and it always exhibits autogamy

32. During parturition, a pregnant woman is having prolonged labour pains and child birth has to be fastened. It is advisable to administer a hormone that can

The correct answer is activate smooth muscles

33. A female undergoing IVF treatment has blocked fallopian tubes. The technique by which the embryo with more than 8 blastomeres will be transferred into the female for further development is

The correct answer is IUT

34. The mode of action of the copper ions in an IUD is to

The correct answer is decrease the movement of the sperms.

35. To produce 400 seeds, the number of meiotic divisions required will be

The correct answer is 500

36. A cross is made between tall pea plants having green pods and dwarf pea plants having yellow pods. In the F2 generation, out of 80 plants how many are likely to be tallplants?

The correct answer is 60

37. In Antirrhinum, RR is phenotypically red flowers, rr is white and Rr is pink. Select the correct phenotypic ratio in F1 generation when a cross is performed between RR X Rr:

The correct answer is 2 Red: 2 Pink

38. What would be the genotype of the parents if the offspring have the phenotypes in 1:1 proportion?

The correct answer is Aa x aa

39. What is the pattern of inheritance in the above pedigree chart?

The correct answer is Autosomal recessive

40. A couple has two daughters. What is the probability that the third child will also be a female?

25. Assertion: Lactational amenorrhea is the natural method of contraception.
Reason: It increases the phagocytosis of sperm.

26. Assertion: Saheli, an oral contraceptive for females, contains a steroidal preparation.
Reason: It is a "once a week" pill with very few side effects.

27. Assertion: Parturition is induced by a complex neuro endocrine meachanism.
Reason: At the end of gestation period, the maternal pituitary releases prolactin which causes uterine contractions.

28. Assertion: When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than nonparental type.
Reason: Higher parental gene combinations can be attributed to crossing over between two genes.