The following F2 results occur from a typical dihybrid cross:
purple: A_B_ 9/16
white: aaB_ 3/16
white: A_bb 3/16
white: aabb 1/1
If a double heterozygote (AaBb) is crossed with a fully recessive organism (aabb), what phenotypic ratio is expected in the offspring?
A) 12 purple : 4 white
B) 3 purple : 1 white
C) 9 purple : 7 white
D) 1 purple : 3 white
E) 1 purple : 1 white
Answer: D
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