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Phenotypically Wild-Type F1 female Drosophila, Whose Mothers Had Light Eyes

Question 15

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Phenotypically wild-type F1 female Drosophila, whose mothers had light eyes (lt) and fathers had straw (stw) bristles, produced the following offspring when crossed to homozygous light-straw males:

 Phenotype  Number
 light-straw  22
 wild-type  18
 light  990
 straw  970
 total  2000
Compute the map distance between the light and straw loci.

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