In fruit flies, dumpy wings are shorter and broader than normal wings. The allele for normal wings D

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In fruit flies, dumpy wings are shorter and broader than normal wings. The allele for normal wings D is dominant to the allele for dumpy wings d. Two normal-winged flies were mated and produced 300 normal-winged and 100 dumpy-winged flies. The parents were probably

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Sol.(c) [Key Concept: Monohybrid Cross — 3:1 Ratio] A 3:1 ratio (300 normal: 100 dumpy) is the classic F2 ratio of a monohybrid cross between two heterozygotes: Dd × Dd → 1/4 DD + 2/4 Dd + 1/4 dd = 3 normal (D_): 1 dumpy (dd). If parents were DD × DD or DD × Dd, no dumpy offspring would appear. If parents were Dd × dd, ratio would be 1:1.

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