In a dihybrid cross for which the parental cross is AABB × aabb,what proportion of F₂ offspring will be heterozygous for both genes? Assume independent assortment. A) 1/4 B) 1/2 C) 3/4 D) All are heterozygotes. E) None are heterozygotes.

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In a dihybrid cross AABB × aabb, the F1 generation will all be AaBb. When these F1 individuals are crossed (AaBb × AaBb), the F2 generation will have a 1:2:1 ratio for each gene. The proportion of offspring that are heterozygous for both genes (AaBb) is 1/4.

In a Dihybrid Cross for Which the Parental Cross Is