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13 January, 09:22

Acho ndroplasia is a form of dwarfism inherited as a completely dominant trait. Two acho ndroplastic dwarfs have a dwarf child; later, they have a second child who is normal. What are the genotypes of the two parents in this mating? What is the probability that their next child will be normal? A dwarf?

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  1. 13 January, 13:01
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    There's 25% probability that their next child will be normal, and 75% of it being a dwarf.

    Explanation:

    Acho ndroplasia (A) is a dominant trait.

    Two acho ndroplastic dwarfs (A_ x A_) have a dwarf child (A_) and a normal child (aa). The second child must be aa because if it had a dominant allele it would also be dwarf.

    The only way for two acho ndroplastic parents to have a normal child is that they are both heterozygous (Aa) for this gene.

    The cross Aa x Aa would produce the following offspring probabilities:

    1/4 AA - dwarf 2/4 Aa - dwarf 1/4 aa - normal

    So there's 1/4=25% probability that their next child will be normal, and 3/4=75% of it being a dwarf.
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