The recessive alleles k (kidney-shaped eyes instead of
wild-type round), c (cardinal-colored eyes instead of wildtype red), and e (ebony body instead of wild-type gray)
identify three genes on chromosome 3 of Drosophila.
Females with kidney-shaped, cardinal-colored eyes were
mated with ebony males. The F1 was wild type. When F1
females were testcrossed with kk cc ee males, the following progeny
k c e 3
k c + 876
k + e 67
k + + 49
+ c e 44
+ c + 58
+ + e 899
+ + + 4
Total 2000
a. Determine the order of the genes and the map
distances between them.
b. Draw the chromosomes of the parents and the F1.
c. Calculate interference and say what you think of its
significance
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