Question

In fruit flies, the gene for white eyes is a SEX-LINKED RECESSIVE TRAIT.
(R) is red and (r) is white.
Cross a white-eyed female with a normal red-eyed male. (remember it is sex-linked so attach to X)
What percent of the offspring will have RED EYES?

Answer 1

X^rX^r and X^RY

Offspring: X^RX^rand X^rY

1/2=0,5= 50 % of offspring will have red eyes