In the fruit fly Drosophila melanogaster, a recessive condition called eyeless (ey) significantly interferes with normal eye development. Eyes are either very small or absent. The ey gene is found on chromosome 4, which is the smallest of the four chromosomes in the organism. Individuals with a single copy or three copies of chromosome 4 are viable and can reproduce.

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Chapter8: Hcpcs Level Ii Coding
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In the fruit fly Drosophila melanogaster, a recessive condition called eyeless (ey) significantly interferes with normal eye development. Eyes are either very small or absent. The ey gene is found on chromosome 4, which is the smallest of the four chromosomes in the organism. Individuals with a single copy or three copies of chromosome 4 are viable and can reproduce.

A trisomic wild-type male is crossed with a disomic wild-type female: see attached image

Determine the chromosome constitution and phenotypic ratios in the offspring. Assume random segregation of chromosomes into gametes.

ev ev ev
X
Ot
evt ev
Transcribed Image Text:ev ev ev X Ot evt ev
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