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11 November, 02:29

One polled (hornless) bull is bred to 3 cows. With Cow A, which is horned, a polled calf is produced. With Cow B, also horned, a horned calf is produced. With Cow C, which is polled, a horned calf is produced. What are the genotypes of the bull and the 3 cows

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  1. 11 November, 04:14
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    Bull = Pp

    Cow A = pp

    Cow B = pp

    Cow C = Pp

    Explanation:

    In cows polled (P) is dominant over horned (p) trait.

    The bull is polled so it can be PP or Pp. Cow B is horned so it must be pp. Resultant offspring from bull X Cow B is also a horned calf (pp). This calf must have received one p from the bull. So the bull's genotype is Pp.

    Cow A is also a horned cow so it must be pp. When bull X Cow A, a polled calf is produced. Since the bull's genotype is Pp and Cow A's genotype is pp, this polled calf will be Pp like the bull.

    Cow C is polled like the bull so it can be PP or Pp. However on crossing with the bull (Pp) a horned calf is produced (pp). This calf got one p allele from the bull and p allele from the Cow C. So Cow C's genotype must be Pp.

    Hence,

    Bull = Pp

    Cow A = pp

    Cow B = pp

    Cow C = Pp
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