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18 January, 05:34

Punnet Square 6. Claud has hereditary rickets, an X-linked dominant disorder. If his partner does not have this

condition, then ... a. If this couple has a son, then what are his chances of having hereditary

rickets? b. If this couple has a daughter, then what are her chances of having hereditary rickets?

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  1. 18 January, 05:36
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    a) the son will not be affected by rickets (0% chance)

    b) the daughter will have rickets (100% chance)

    Explanation:

    Since only the father has rickets and it is a X-linked dominant trait, the mother has two normal X chromosomes. The X chromosome received from the mother by the son will not result in the rickets since the father will have contributed the Y chromosome and that does not have the gene for rickets. In case of the daughter, she will receive the defective X chromosome from her father, which will cause her to have the rickets disease.

    Hope that answers the question, have a great day!
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