In Drosophila, the vestigial wings recessive allele,vg, causes the wings to be very small. A geneticistcrossed some true-breeding wild-type males to some vestigial virgin females. The male and female F1 flieswere wild type. He then allowed the F1 flies to matewith one another and found that 1/4 of the male andfemale F2 flies had vestigial wings. He dumped thevestigial F2 flies into a morgue and allowed the wildtype F2 flies to mate and produce an F3 generation.a. Give the genotype and allele frequencies amongthe wild-type F2 flies.b. What will be the frequencies of wild-type andvestigial flies in the F3?c. Assuming the geneticist repeated the selection againstthe vestigial F3 flies (that is, he dumped them in amorgue and allowed the wild-type F3 flies to mate atrandom), what will be the frequency of the wild-typeand mutant alleles in the F4 generation?d. Now the geneticist lets all of the F4 flies mate atrandom (that is, both wild-type and vestigial fliesmate). What will be the frequencies of wild-typeand vestigial F5 flies?
In Drosophila, the vestigial wings recessive allele,
vg, causes the wings to be very small. A geneticist
crossed some true-breeding wild-type males to some vestigial virgin females. The male and female F1 flies
were wild type. He then allowed the F1 flies to mate
with one another and found that 1/4 of the male and
female F2 flies had vestigial wings. He dumped the
vestigial F2 flies into a morgue and allowed the wildtype F2 flies to mate and produce an F3 generation.
a. Give the genotype and allele frequencies among
the wild-type F2 flies.
b. What will be the frequencies of wild-type and
vestigial flies in the F3?
c. Assuming the geneticist repeated the selection against
the vestigial F3 flies (that is, he dumped them in a
morgue and allowed the wild-type F3 flies to mate at
random), what will be the frequency of the wild-type
and mutant alleles in the F4 generation?
d. Now the geneticist lets all of the F4 flies mate at
random (that is, both wild-type and vestigial flies
mate). What will be the frequencies of wild-type
and vestigial F5 flies?
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