Solutions For An Introduction to Genetic Analysis Chapter 17 Problem 50P

The cross can be represented in the following way:

Parents:

X^y+Y [irradiated] x X^yX^y

Progeny:

• Mostly X^yY males

• Two gray males

a) The gray male 1 was crossed with a yellow body female giving all yellow females and all gray males in the progeny. This indicates reverse sex linkage. If the y+ allele was translocated to the Y chromosome, the gray male would be X^yY^y+. when these males are crossed with yellow females, the results would be:

X^yX^y yellow females

X^yY^y+ gray males

b) The gray male 2 was crossed with a yellow female, giving gray and yellow males and females in equal proportions. If the y+ allele was translocated to an autosome, the progeny would be as shown where A indicates autosome:

Parents:

A^y+/A; X^yY x A/A; X^yX^y

Progeny:

• A^y+/A; X^yX^y gray female

• A^y+/A; X^yY gray male

• A/A; X^yX^y yellow female

• A/A; X^yY yellow male