The grain color in wheat is controlled by thr | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The inheritance of grain color in wheat is an example of polygenic inheritance involving $3$ pairs of genes $(n=3)$.In this case,the parental phen

Vedclass · Accepted Answer

$2/64$

Vedclass · Answer

(D) The inheritance of grain color in wheat is an example of polygenic inheritance involving $3$ pairs of genes $(n=3)$.In this case,the parental phenotypes are extreme: one is dark red (all dominant alleles,$AABBCC$) and the other is white (all recessive alleles,$aabbcc$).According to the binomial expansion $(1/2 + 1/2)^{2n}$,where $n=3$,the total number of combinations is $2^{2n} = 2^6 = 64$.The parental phenotypes (extreme red and extreme white) appear only when all alleles are dominant or all are recessive.The probability of obtaining the genotype $AABBCC$ is $(1/4)^3 = 1/64$.The probability of obtaining the genotype $aabbcc$ is $(1/4)^3 = 1/64$.Therefore,the total fraction of offspring resembling the parental phenotypes is $1/64 + 1/64 = 2/64$.

The grain color in wheat is controlled by three pairs of polygenes. When a red-grained wheat variety is crossed with a white-grained variety,an $F_1$ hybrid is produced. When the $F_1$ hybrid is self-pollinated,what fraction of the $F_2$ generation will resemble the parental phenotypes?

Similar Questions

Choose the possible genotype responsible for lightest skin colour in human beings.

What are polygenes? Explain polygenic inheritance with the example of human skin color.

The inheritance of human skin color is an example of ........

An example of a quantitative trait in humans is .....

Which of the following statements is correct about polygenic inheritance?

Vedclass Test Series

Exam Paper Generator

Online Exam Module