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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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oakrueangsit oakrueangsit
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11 years ago
How does the dihybrid cross support the Law of Independent Assortment?
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OAK

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#1
11 years ago
In a dihybrid cross of, for example AaBb X AaBb, you would expect the progeny phenotypic ratio to be 9/16 A_B_; 3/16 A_bb; 3/16 aaB_; 1/16 aabb

If you look at just A_:aa, you see 3/4:1/4, and if you look at B_:bb, you see again 3/4 B_:1/4 bb.

The 9:3:3:1 ratio occurs because of the independent assortment of these two genes. If you just combine the two 3:1 ratios, you get the 9:3:3:1.
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