A male fruit fly with red eyes and short wings is mated to a female with brown e

Question

A male fruit fly with red eyes and short wings is mated to a female with brown eyes and long wings. All the F1 offspring are red-eyed and long winged. The F1 are intercrossed to produce and F2. The F2 show the following phenotypes

6/16 red-eye, long-wing female

3/16 red eye-long wing male

3/16 red eye-short wing male

1/16 brown eye, long wing male

1/16 brown eye, short wing male

Which forms are dominant? What are the genotypes of the parents and the F1 females and males?

What are the possible genotypes of each F2 progeny?

Explanation / Answer

The genotype of a male fruit fly with red eyes and short wings is RR ww and a female with brown eyes and long wings is BB WW. The R (red) gene is dominant to B (brown); long wings are dominant to short wings. Cross between these two will have the offpsring with the following genotypes.

RR ww* BB WW = 100% RB wW. -------> F1

Cross between F1 generation will have the offpsring (F2) with following genotypes.

RB wW* RB wW =

6/16 red-eye, long-wing female (BRWw, BRwW, RBWW, RBWW, RBWw, RBWw)

3/16 red eye-long wing male (RRwW, RRWW, RRWw)

3/16 red eye-short wing male (RRww, BRww, RBww)

1/16 brown eye, long wing male (BBWW)

1/16 brown eye, short wing male (BBww)

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