In a cross where both parents are heterozygous for a trait with dominant allele T, what is the probability of the recessive phenotype?

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Prepare for the Virginia 7th Grade Science SOL Test. Incorporate flashcards and multiple choice questions, each with hints and detailed explanations. Ensure your success on the exam!

Multiple Choice

In a cross where both parents are heterozygous for a trait with dominant allele T, what is the probability of the recessive phenotype?

Explanation:
When both parents are heterozygous (Tt), each parent can pass either the dominant T or the recessive t allele. Crossing Tt × Tt gives four equally likely genotype outcomes: TT, Tt, Tt, and tt. Only the tt genotype shows the recessive phenotype, so one out of four offspring will display it. That’s a quarter, or one in four.

When both parents are heterozygous (Tt), each parent can pass either the dominant T or the recessive t allele. Crossing Tt × Tt gives four equally likely genotype outcomes: TT, Tt, Tt, and tt. Only the tt genotype shows the recessive phenotype, so one out of four offspring will display it. That’s a quarter, or one in four.

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