A cross is made between homozygous wild-type female Drosophila (a+ a+ b+ b+ c+ c+ ) and triple-mutant males (aa bb cc) (the order here is arbitrary). The F1 (a+ a b+ b c+ c) females are test crossed back to the triple-mutant males and the F2 phenotypic ratios are as follows:
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a', b, and c = 18
a, b, and c = 112
308 = a bc
a', b', and c' = 66
a b c 59 a b c 59 a b c
a' b'c'=320 a' b'c'=320 a' b'c
102 = abc
a b'c=15
1000 in total
Explanation:
Homozygous wild type : For a given trait, homozygous means having two identical alleles. For a given trait, heterozygous means having two distinct alleles.
test cross: A test cross is a way to look at the genotpye of an organism. To find out which alleles were present in a genotype, the test cross was initially used as an experimental mating test.
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