The production of eye color pigment in Drosophila requires the dominant allele A?

The production of eye color pigment in Drosophila requires the dominant allele A.


The dominant allele P of a second independent gene turns the pigment to purple but its


recessive allele leaves it red. A fly producing no pigment has white eyes. Two pure


lines were crossed with the following results:


P red-eyed female x white-eyed male


F1 purple-eyed females


red-eyed males


F2 Both males and females: 3/8 purple-eyed


3/8 red-eyed


2/8 white-eyed


Explain this mode of inheritance and show the genotypes of the parents, the F1, and the


F2.The production of eye color pigment in Drosophila requires the dominant allele A?
Both genes are sex-linked.





P : AApp 脳 a-P-


F1: AaPp 脳 A-p-


F2: AAPp, AApp, AaPp, Aapp, A-P-, A-p-, a-P-, a-p-

red hair