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4 September, 10:59

A hornless bull is crossed with three cows, A, B, and C. Cow A is horned and produces calf A', which is also horned. Cow B is hornless and produces calf B', which is horned. Cow C is horned and produces calf C', which is hornless. Which is the dominant trait? Explain your reasoning. Give the genotypes of all seven animals.

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  1. 4 September, 12:40
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    The dominant trait is hornless.

    If this is correct, then the original bull is a heterozygote:

    H = hornless

    h = horned

    Bull is Hh

    Cross 1: Hh x hh (horned female) - offspring is hh (horned)

    Cross 2: Hh x Hh (hornless female) - offspring is hh (horned)

    Cross 3: Hh x hh (horned female) - offspring is Hh (hornless)

    Cross 3 is the key to confirming this because the only way to get a hornless offspring would be if hornless is recessive.
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