Question

In Drosophila, b+ is the allele for normal body color and at the same gene b is the allele for black body color. A second gene controls wing shape. The shape can be either normal (vg+) or vestigial (vg). A cross is made between a homozygous wild type fly and fly with black body and vestigial wings. The offspring were then mated to the recessive homozygote (black body, vestigial winged) flies. The following segregation ratio was observed: Phenotype # Observed Wild Type 405 Normal, vestigial 85 Black, normal 100 Black, vestigial 410 What is the genetic distance between these genes?

          In Drosophila, b+ is the allele for normal body color and at the same gene b is the allele for black body color. A second gene controls wing shape. The shape can be either normal (vg+) or vestigial (vg). A cross is made between a homozygous wild type fly and fly with black body and vestigial wings. The offspring were then mated to the recessive homozygote (black body, vestigial winged) flies. The following segregation ratio was observed:

Phenotype # Observed
Wild Type 405
Normal, vestigial 85
Black, normal 100
Black, vestigial 410

What is the genetic distance between these genes?

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In Drosophila, b+ is the allele for normal body color and at the same gene b is the allele for black body color. A second gene controls wing shape. The shape can be either normal (vg+) or vestigial (vg). A cross is made between a homozygous wild type fly and fly with black body and vestigial wings. The offspring were then mated to the recessive homozygote (black body, vestigial winged) flies. The following segregation ratio was observed:

Phenotype # Observed
Wild Type 405
Normal, vestigial 85
Black, normal 100
Black, vestigial 410

What is the genetic distance between these genes?

Added by James P.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Jenny Wu

01/08/2023

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We have two genes in Drosophila: one for body color (with alleles b* for normal and b for black) and another for wing shape (with alleles vg* for normal and vg for vestigial). A cross is made between a homozygous wild type (b*b* vg*vg*) and a fly with black body Show more…

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In Drosophila, b+ is the allele for normal body color and at the same gene b is the allele for black body color. A second gene controls wing shape. The shape can be either normal (vg+) or vestigial (vg). A cross is made between a homozygous wild type fly and fly with black body and vestigial wings. The offspring were then mated to the recessive homozygote (black body, vestigial winged) flies. The following segregation ratio was observed: Phenotype # Observed Wild Type 405 Normal, vestigial 85 Black, normal 100 Black, vestigial 410 What is the genetic distance between these genes?

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