alleryIndependent assortment is demonstrated by a dihybrid cross resulting in a phenotypic ratio of
A9 : 3 : 3 : 1
B3 : 1 (typical)
C1 : 2 : 1
D12 : 4
Answer & Solution
Correct answer: A. 9 : 3 : 3 : 1
1. In a dihybrid cross AaBb × AaBb, alleles of A assort independently from those of B.
2. Four gamete combinations occur in each parent giving 16 offspring combinations.
3. The classic 9 : 3 : 3 : 1 phenotypic ratio confirms independent assortment.
_Source: Maharashtra Balbharati Std XII Biology, Ch 3 "Inheritance and Variation" §3.4_
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