an organism of the genotype AaBbCc was test-crossed to a triply recessive organi

Question

an organism of the genotype AaBbCc was test-crossed to a triply recessive organism (aabbcc). The genotypes of the progeny are in the table below.

Genotype #of progeny
AaBbCc 20
aabbCc 20
AabbCc 5
aaBbCc 5
AaBbcc 20
aabbcc 20
Aabbcc 5
aaBbcc 5

a) Assuming simple dominance and recessiveness in each gene pair, if these three genes were all assorting independently, how many genotypic and phenotypic classes would result in the offspring, and in what proportion?
b) Answer part a) again, assuming the three genes are so tightly linked on a single chromosome that no crossover gametes were recovered in the sample of offspring.
c) What can you conclude from the actual data about the location of the three genes in relation to one another?

Explanation / Answer

You're missing one of the phenotypes, Abc

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