Question

Consider the cross X ^(v+ cv+ y+) / X ^(v+ cv+ y+) X X ^(v cv y)/ Y

Female homozygous dominant for all; male homozygous recessive for all alleles

v=vermillion eyes (recessive)

cv=crossveinless wings (recessive)

y=yellow body (recessive)

A) find F1 genotypes for females

B) find F1 genotypes for males

C) find F1 phenotypes for females

D) find F1 phenotypes for males

Answer 1

Consider the cross
Female                                              X            Male
X ^(v+ cv+ y+) / X ^(v+ cv+ y+)      X         X ^(v cv y)/ Y
Female homozygous dominant for all
male homozygous recessive for all

The notation tells you that the alleles of interest are X linked, that's why the female has twice as much than the male, also remember that from female offspring normally the female gives one X chromosome and the male the other, and for male offspring, the female is the one that gives the X chromosome

A) find F1 genotypes for females

X ^(v+ cv+ y+) / X ^(v cv y)
Because one X wil come from the female and the other from the male

B) find F1 genotypes for males

X ^(v+ cv+ y+)/Y
Becuse the X will come from the female

C) find F1 phenotypes for females

All the females would have a normal phenotype because althogh the genotype is X ^(v+ cv+ y+) / X ^(v cv y), the v, cv, y alleles are recesive and wont express in presens of the dominat v+ cv+ y+ allels

D) find F1 phenotypes for males

Also, all the males would have a normal phenotype because this generation of males inherited from a female homozygous dominant, and don't carry any of the v, cv, y alleles