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In a cross involving tall and dwarf pea traits, what ratio of tall to dwarf plants appears in the second generation?

Answer and explanation

Correct answer: 3 : 1

In the usual monohybrid experiment, F1 plants are heterozygous Tt. Self-pollination gives Tt × Tt, producing TT, Tt, Tt and tt in a 1:2:1 genotypic ratio. Since TT and Tt are tall and only tt is dwarf, the observable phenotypic ratio is three tall plants to one dwarf plant, or 3:1. Therefore option A is correct.

Related tags

Monohybrid RatioMendelTall DwarfHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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