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5 October, 03:59

Plant A and Plant B are heterozygous for a gene that expresses their tall trait (Tt). Upon crossing, what is expected in the offspring, assuming random chromosome segregation?

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  1. 5 October, 06:37
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    The answer is 75% of offspring will be tall and 25% of offspring will be short.

    If:

    T - the dominant allele for tall trait

    t - the recessive allele for short trait

    Then:

    TT - dominant homozygote (tall)

    Tt - heterozygote (tall)

    tt - recessive homozygote (short).

    In the cross of two heterozygotes Tt x Tt 75% of offspring will be tall and 25% of offspring will be short:

    Parental generation: Tt x Tt

    Offspring generation: TT Tt Tt tt

    Thus, 3 out of 4 (=3/4=75%) offspring are tall (1 TT and 2 Tt) and 1 out of 4 (=1/4=25%) offspring is short. Speaking of genotypes, 1 out of 4 (=1/4=25%) is dominant homozygote (TT), 2 out of 4 (=2/4=50%) is heterozygote (Tt), and 1 out of 4 (=1/4=25%) is recessive homozygote (tt).
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