Answer to Question #145482 in Genetics for Vaith

Question #145482
A brown-eyed girl with normal sight got married to a blue-eyed man with normal sight. The father of the girl was blue-eyed and color-blind. What is F1? It is known that gene of brown color of eye dominates over the gene of blue eye color. The gene of color blindness is recessive and X-linked.
1
Expert's answer
2020-11-20T05:49:45-0500

Let the gene for color blindness be n, and that for normal color vision be N.

Also let the gene for blue-eyes be b, and that for brown eyes be B.

Then the father of the girl must have been genotype XnYbb (blue eyed and color blind)

The genotype of the girl then is XnXNBb and his husband is XNYbb

There gametes are;

Girl = XnB, Xnb, XNB, XNb,

Husband = XNb and Yb,


                      Girl: XnB, Xnb XNB XNb

Husband


Yb, XnB Yb Xnb Yb XNB Yb XNb Yb

XNb XnB XNb Xnb XNb XNB XNb XNb XNb

F1 genotypes = Phenotypes

Boys

XnB XNb = Brown eyes & normal color vision

Xnb XNb = Blue-eye & normal color vision

XNB XNb = brown eyes & normal color vision

XNb XNb = Blue eyes & normal color vision

Gils

XnB Yb =Brown eyes & color blind

Xnb Yb = Blue eyes & color blind

XNB Yb =Brown eyes & normal color vision

XNb Yb = Blue eyed & normal color vision





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