Question

A vestigial-winged, hairy male is crossed with a wild-type female, homozygous at both genes. This F1 generation is crossed to produce the F2 generation. Which of the following are accurate expectations regarding the F1 or F2 generations resulting from this cross? Choose all reasonable answers. Please draw the full 4x4 Punnett Square to answer this question.a.The expected proportion of F2 individuals which are homozygous recessive at both genes is 1/16b.Most of the F2 generation will have the normal phenotypes for both genesc.The expected proportion of F2 individuals with at least one recessive phenotype (either hairy or vestigial wings) is 8/16d.All of the F1 generation will have the normal phenotypes for both genese.There will be no homozygous individuals in the F1 generation

Answer 1

Answer:

The expected proportion of F2 individuals which are homozygous recessive at both genes is 1/16

All of the F1 generation will have the normal phenotypes for both genes

There will be no homozygous individuals in the F1 generation

Most of the F2 generation will have the normal phenotypes for both genes

Explanation:

A winged hairy male is crossed with a wild type female which is homozygous

Let the allele for vestigial trait be v

allele for wild trait be w

allele for hairy trait be h

Allele for non hairy be n

The genotype of parents would be

vvhh * wwnn

Thus in F1 generation all the offsrping will have  normal phenotypes for both genes

In F2 generation

vwnh * vwnh

Out of 16 offspring only one wil be homozygous recessive i,e

wwnn

Rest all 15 will have normal phenotypes.

Hence, the correct answer is

The expected proportion of F2 individuals which are homozygous recessive at both genes is 1/16

All of the F1 generation will have the normal phenotypes for both genes

There will be no homozygous individuals in the F1 generation

Most of the F2 generation will have the normal phenotypes for both genes