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In a plant, the yellow-seed trait is dominant over the green-seed trait. If two first-generation plants are crossed, which trait may reappear in the second generation?

Answer and explanation

Correct answer: Green seed

The governing concept is dominance and recessiveness in a monohybrid cross. If the parental plants are pure yellow YY and green yy, all first-generation plants are Yy and appear yellow because Y is dominant. Crossing Yy × Yy gives YY, Yy, Yy and yy; the yy combination expresses green seeds in the second generation. Thus the recessive trait is hidden in F1 but can reappear in F2.

Related tags

Dominant TraitRecessive TraitMonohybrid CrossHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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