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 970
straw 970
Total: 2000
Compute the map distance between the light and straw loci.
A) 4 map units B) 8 map units C) 2 map units D) 98 map units E) 12 map units
Answer: C
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