Solutions For An Introduction to Genetic Analysis Chapter 2 Problem 45P

Charlie may not be homozygous for one of these alleles. Also his mate may not be homozygous for one of these alleles. But both of them may not be heterozygous because all the F₁ generation was black-and-white. So, one of them would be heterozygous. The cross can be explained as follows.

A = black and white

a = red and white

Parents--------- A/a A/A

F₁ generation A/A, A/A, A/a, A/a

So, 1:1

Two heterozygotes from F₁ are crossed.

A/a A/a

F₂ generation- AA, Aa, Aa, aa

1A/A – black and white

2 A/a – black and white

1 a/a - red and white

If the F₂ progeny came only from one mate, the decision of the farmer was too hasty.

If the F₂ progeny came from more than one mate, then the action of the farmer was correct.