An organism of the genotype AaBbCc was testcrossed to a triply recessive organism (aabbcc). The genotypes of the progeny are presented in the following table. 20 AaBbCc 20 AaBbcc 20 aabbCc 20 aabbcc 5 AabbCc 5 Aabbcc 5 aaBbCc 5 aaBbcc (a) If these three genes were all assorting independently, how many genotypic and phenotypic classes would result in the offspring, and in what proportion, assuming simple dominance and recessiveness in each gene pair? (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?
An organism of the genotype AaBbCc was testcrossed to a triply
recessive organism (aabbcc). The genotypes of the progeny are
presented in the following table.
20 AaBbCc 20 AaBbcc
20 aabbCc 20 aabbcc
5 AabbCc 5 Aabbcc
5 aaBbCc 5 aaBbcc
(a) If these three genes were all assorting independently, how
many genotypic and
and in what proportion, assuming simple dominance and
recessiveness in each gene pair?
(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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