2. The P, Q, and R loci are all on different autosomes in a certain mammalian sp

Question

2. The P, Q, and R loci are all on different autosomes in a certain mammalian species. The S locus however is X-linked. P, Q, R, and S are completely dominant alleles. The following cross was made: female P/p ; Q/q ; R/r ; S/s × male p/p ; Q/q ; r/r ; S. With respect to these four genes

(a) what proportion of sons will phenotypically resemble their fathers? (b) what proportion of sons will phenotypically resemble their mothers? (c) what proportion of daughters will phenotypically resemble their mothers? (d) what proportion of daughters will phenotypically resemble their fathers? (e) what proportion of daughters will genotypically resemble their mothers? (f) what proportion of progeny will have one of the parental phenotypes?

Explanation / Answer

In case of X-linked diseases, males exhibit the phenotype even they inherit one defective allele, whereas females have to inherit two defective alleles.

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