in human beings, a recessive X-linked mutation, g, causes green-defective color

Question

in human beings, a recessive X-linked mutation, g, causes green-defective color vision; the wild type allele, G, causes normal color vision. A man (a) and a woman (b), both with normal vision, have three children, all married to people with normal vision: a color-defective son (c), who has a daughter with normal vision (f); a daughter with normal vision (d), who has one color-defective son (g) and two normal sons (h); and a daughter with normal vision (e), who has six normal sons (i). Give the most likely genotypes for the individuals (a to i) of this family.

Explanation / Answer

XG----------------NORMAL ALLLE

NORMAL VISION Xg XG -------------------parental



Daughter s genotypes------------ CARRIER NORMAL VISION Xg XG , OR


NORMAL VISION XG XG
a color-defective son (c),------------- genotype --------- Xg Y


daughter with normal vision (f)------------------ CARRIER NORMAL VISION Xg XG


daughter with normal vision (d),--------------------- CARRIER NORMAL VISION Xg XG


color-defective son (g)------------------- genotype --------- Xg Y


two normal sons (h)---------------- XG Y


daughter with normal vision (e),------------------- XG XG


six normal sons (i).----------------- XG Y

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