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A cross gives a phenotypic ratio of three tall and one dwarf. Which genotype cross best explains this result?

Answer and explanation

Correct answer: Tt cross Tt

For a single trait with complete dominance, the 3:1 phenotypic ratio is the expected result of crossing two heterozygotes. In Tt × Tt, the genotypes are TT, Tt, Tt, and tt in a 1:2:1 ratio. Three offspring show the dominant tall phenotype and one shows the recessive dwarf phenotype. TT × TT gives all tall, TT × tt gives all tall, and Tt × TT gives all tall phenotypically, so only option C fits.

Related tags

GenotypePhenotypeMonohybrid CrossMendelHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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