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21 June, 21:30

In humans, a type of blindness is due to a dominant allele; normal vision is the result of a recessive allele. Migraine headaches are due to a dominant allele, and normal (no headaches) is recessive. A male who is heterozygous for blindness and does not suffer from headaches marries a woman who has normal vision and does not suffer from migraines. Could they produce a child with normal vision who does not suffer from headaches? If yes, can the probability of such a child be determined?

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  1. 21 June, 21:36
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    Yes.

    Probability of such child = 1/2 or 50%

    Explanation:

    According to the question, below are the genotypes and phenotypes possibilities:

    aa = normal vision & no headache

    Aa = normal vision & no headache

    AA = blindness & headache

    Male Female

    Aa aa

    Possible genotypes of progeny: Aa Aa aa aa

    So it is clear that out of the 4 probable children, 2 with 'genotype aa' will have normal vision & no headache.

    Mathematical expression is as under:

    2/4 = 1/2 that means 50% progeny.
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