Question

You have considered single locus and two locus (di) hybrid crosses for loci with alleles that...

You have considered single locus and two locus (di) hybrid crosses for loci with alleles that are completely dominant/recessive.

a)Come up with a general rule for the proportion of offspring expected to have the phenotype of all the recessive traits associated with X autosomal loci when fully heterozygous parents are crossed.

b)Now, use that logic and provide the expected proportion of offspring that show recessive phenotype for 4 loci and the dominant phenotype the 5th locus when two fully heterozygous parents are crossed.

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Answer #1

A) The product rule is used to find the desired probability. We have to multiply the each independent event.

For Monohybdrid cross between heterozygous parent:

Parent: Aa × Aa

The probability of aa ( homozygous recessive ) is 1/4 as seen in the punnet square below.

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