Answers to mastering biology drag the labels to their appropriate locations to complete the punnett squares for morgan's reciprocal cross. drag blue labels onto the blue targets to indicate the genotypes of the parents and offspring. drag pink labels onto the pink targets to indicate the genetic makeup of the gametes (sperm and egg). labels can be used once, more than once, or not at all. hints

In the first half of the reciprocal cross, the we can see that the male gametes are w and blank (b). Since we know the male fly has one Y chromosome, we know that b must be Y, and that a must therefore be wY

We can see the female is homozygous w+w+, meaning her gametes are all w+, meaning c must be w+. The male in d will inherit the w+ from the mother and Y from the father, so must be w+Y

In the second half, the male is red, and we can see he carried the w+ allele. This means his other allele and potential gamete (f) must be Y, and his genotype (e) must be w+Y.

The female is homozygous ww, meaning all her gametes (g) will be w. The genotype of the male in h must be wY, as he will inherit a Y from his father and a w from his mother.