how would i answer this?

Question

in drosophila the fruit fly select a female and bread her to a male from a pure breeding strain of white eyed flies .

in the the fruit fly sex determination is the same as n humans. hormal flies have bright red eyes, a certain recessive sex liunked gene is responsible for white eyes. from a pure breeding strain of red eyed flies select a female and bread her to a male from a oure breeding strain of white flies. how would i i need the crosses so i can do it on a punit square

Answer 1

Let R be the allele for Red eyes
and r be the allele for white eyes.


Female selected from the pure red eyed strain:

X^R X^R

Male from the white eyed strain:

X^r Y

Then:

X^R X^R
_____________________________
X^r ! X^RX^r ! X^RX^r ! all heterozygous red-eyed females
----------------------------------------------------
Y ! X^R Y ! X^R Y ! all red-eyed males

Answer 2

You are attempting to do a genetic cross. You do not give enough information in your question to answer it.

BIOLOGY TEACHER