In the fruit fly, the mutations dusky body color(dy), cut wings(ct).and white ey

Question

In the fruit fly, the mutations dusky body color(dy), cut wings(ct).and white eyes(w) are a recessive alleles located on the x chromosome. Females heterozygous for all three mutations were crossed to dy ct w, and the following phenotypes were observed among the 500 offspring.
Wildtype 18
Dusky 153
Cut 6
White 76
Cut,White 150
Dusky,Cut 72
Dusky,Cut,White 22
Dusky,White 3
what are the genotypes of the two maternal X chromosomes, with the genes in the correct order?( Please explain it clearly)
a) dy+ w/ + ct
b) dy ++/ +w ct
c) dy w +/+ ct
d)dy w ct/ +++
e)+ ct +/ dy+ w

Explanation / Answer

In the fruit fly, the mutations dusky body color(dy), cut wings(ct).and white eyes(w) are a recessive alleles located on the x chromosome. Females heterozygous for all three mutations were crossed to dy ct w, and the following phenotypes were observed among the 500 offspring.
Wildtype 18
Dusky 153
Cut 6
White 76
Cut,White 150
Dusky,Cut 72
Dusky,Cut,White 22
Dusky,White 3
what are the genotypes of the two maternal X chromosomes, with the genes in the correct order?( Please explain it clearly)
a) dy+ w/ + ct
b) dy ++/ +w ct
c) dy w +/+ ct
d)dy w ct/ +++
e)+ ct +/ dy+ w

The two most common classes are non recombinanat =parental types, so the mother genotypedy ++/ +w ct

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