Principle of Inheritance and VariationEasyBloom L3
Question
Among white human beings, when individuals with straight hair mate with those with curly hair, wavy-haired children are produced. If two individuals with wavy hair mate, what phenotypes and ratios would you predict among their offspring?
Options
A.3 curly : 1 wavy
B.1 curly : 1 wavy : 1 straight
C.1 straight : 1 curly : 2 wavy
D.3 wavy : 1 straight
Solution
Sol.(c) [Key Concept: Incomplete Dominance — Hair Texture] Straight (SS) × curly (ss) → all wavy (Ss). This is incomplete dominance. Wavy × Wavy: Ss × Ss → 1/4 SS (straight): 2/4 Ss (wavy): 1/4 ss (curly) = 1 straight: 2 wavy: 1 curly. This is the 1:2:1 ratio characteristic of incomplete dominance. The same as 1 straight: 1 curly: 2 wavy = option (c).
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