An organism of the genotype AaBbCc was testcrossed to a triplyrecessive organism (aabbcc). The genotypes of the progeny are inthe following table.AaBbCc 20 AaBbcc 20aabbCc 20 aabbcc 20AabbCc 5 Aabbcc 5aaBbCc 5 aaBbcc 5 a.) Assuming simple dominance and recessiveness in each genepair, if these three genes were all assorting independently,how many genotypic and phenotypic classes would result inthe offspring, and in what proportion? b.) Answer part (a) again, assuming the three genes are sotightly linked on a single chromosome that no crossovergametes were recovered in the sample of offspring. c.) What can you conclude from the actual data about thelocation of the three genes in relation to one another?
An organism of the genotype AaBbCc was testcrossed to a triply
recessive organism (aabbcc). The genotypes of the progeny are in
the following table.
AaBbCc 20 AaBbcc 20
aabbCc 20 aabbcc 20
AabbCc 5 Aabbcc 5
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
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?
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