In fruit flies, red eyes (pr+_) are dominant to purple eyes (prpr) and normal wings (vg+_) are dominant to vestigial wings(vgvg). The genes are located on the same chromosome. A purebreeding red-eyed fly with vestigial wings was crossed with a pure-breeding purple-eyed fly withnormal wings. All of the F1 progeny had a WT phenotype. •What isthe arrangement of alleles on the F1's chromosome? •The recombination frequency between the two genes is 15%. If an F1 individual were testcrossed, what percentage of the progeny would you expect to have the WT phenotype?

Question
Asked Oct 27, 2019
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In fruit flies, red eyes (pr+_) are dominant to purple eyes (prpr) and normal wings (vg+_) are dominant to vestigial wings
(vgvg). The genes are located on the same chromosome. A pure
breeding red-eyed fly with vestigial wings was crossed with a pure-breeding purple-eyed fly with
normal wings. All of the F1 progeny had a WT phenotype.
 
•What isthe arrangement of alleles on the F1's chromosome?
 
•The recombination frequency between the two genes is 15%. If an F1 individual were test
crossed, what percentage of the progeny would you expect to have the WT phenotype?
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Expert Answer

Step 1

A test cross is defined as the genetic cross that occurs between a homozygous recessive individual and a corresponding suspected heterozygote. The purpose of the test cross is to determine if the genotype of the individual is homozygous dominant or recessive.

Step 2

The genotypes of the parent are given below:

Parent 1: red-eyed fly with vestigial wings: pr+ vg/pr+ vg

Parent 2: purple-eyed fly with normal wings: pr vg+/pr vg+

The arrangement of alleles on the F1’s chromosome is pr+ vg/pr vg+ (phenotypically wildtype).

Step 3

When an F1 individual is test crossed, it...

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Туре Genotype Phenotype Percentage of progeny with 45 pr vg"/pr vg Parental Purple-eyed normal wings Red-eyed vestigial wings Red-eyed normal wings Purple-eyed vestigial wings with 45 Parental pr" vg/pr vg with 5 pr vg /pr vg Recombinant with 5 Recombinant pr vg/pr vg

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