In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
10 wild-type
240 brown
240 bright red
10 orange
The mother of these progeny resulted from a cross between flies from two true-breeding lines.
What are the genotypes of these two lines?
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In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respecti...
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