Answer Happy

Remember that white eyes are an X-linked recessive trait
in Drosophila. A population of female flies of
genotype w+/w is mated to a
population of white-eyed male flies. A red-eyed female fly is
chosen from the F1 offspring and mated with a
red-eyed male. All of the F2 flies have red
eyes.
Remember the following: XX -
female
XXY –
female
XYY - male
XY –
male
X -
male
OY - lethal
XXX –
lethal
YY - lethal
a) Did non-disjunction occur in a P female during meiosis I
or meiosis II ? Justify your answer.
b) What was the genotype of the chosen red-eyed
F1 female? Justify your answer.