In the F2 generation of a dihybrid cross between yellow, round seeded and green, wrinkled seeded pea

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In the F2 generation of a dihybrid cross between yellow, round seeded and green, wrinkled seeded pea plants, 17 out of 254 pea seeds were green and wrinkled. Other seeds were: Yellow and round; green and round; yellow and wrinkled. What do these results indicate?

Accepted Answer

Sol.(b) [Key Concept: Dihybrid Cross — Recessive Characters] The proportion of green and wrinkled seeds (17/254 ≈ 6.7%) is close to the expected 1/16 (6.25%) in a standard F2 dihybrid ratio (9:3:3:1). This means both green and wrinkled are recessive characters — they only appear in the double-homozygous recessive condition (ggww). The results are consistent with two independently assorting genes, both of which are recessive in their respective alternative forms.

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