Biology 214/414 Homework 4

Consider involving three genes in peas; each of the three has two alleles which, in all three cases, display simple dominance-recessiveness relationships.  The three dominant alleles are A, B, and D and the corresponding recessive alleles are a, b, d.
1.	A/a and B/b are not linked.  What are the percentages of AB, Ab, aB, and ab gametes expected from a pea plant that is AaBb?
2.	A/a and D/d are linked and are 7 map units apart.  What are the percentages of AD, Ad, aD, and ad gametes expected from a pea plant that is AaDd?
3.	What percentage of offspring from a cross of AaDd X aadd plants is expected to be Aadd?

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