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15 May, 09:45

In cats, orange coat color is determined by the b allele, and black coat color is determined by the B allele. The heterozygous condition results in a coat pattern known as tortoiseshell. This gene is X-linked. Part A What kinds of offspring would be expected from a cross of an orange male and a tortoiseshell female?

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  1. 15 May, 11:44
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    Xᵇ Xᴮ : tortoiseshell female;

    Xᵇ Xᵇ : orange female;

    Xᴮ Y: black male;

    Xᵇ Y: orange male.

    Explanation:

    The possible genotypes and phenotypes for coat color in cats is:

    Females

    XᵇXᵇ: orange XᴮXᴮ: black XᴮXᵇ: tortoiseshell

    Males

    XᵇY: orange XᴮY: black

    Cross of an orange male and a tortoiseshell female

    XᵇY x XᴮXᵇ

    The male produces the gametes Xᵇ and Y; the female produces the gametes Xᴮ and Xᵇ.

    The expected offspring resulting from the combination of those gametes is:

    Xᵇ Xᴮ : tortoiseshell female Xᵇ Xᵇ : orange female Xᴮ Y: black male Xᵇ Y: orange male
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