In Drosophila the genes forked bristles (f and f+) and vermilion eyes (v and v+) are ~24 m.u.  apart on the X chromosome.  From a cross of f v / f+ v+ females with f v / y males, what % of the progeny do you expect to  have the f+ v+ phenotypes? (Don’t let the X chromosome throw you off – this question is  essentially asking what % of the female’s gametes will be f+ v+).

Human Anatomy & Physiology (11th Edition)
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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In Drosophila the genes forked bristles (f and f+) and vermilion eyes (v and v+) are ~24 m.u. 
apart on the X chromosome. 

From a cross of f v / f+ v+ females with f v / y males, what % of the progeny do you expect to 
have the f+ v+ phenotypes? (Don’t let the X chromosome throw you off – this question is 
essentially asking what % of the female’s gametes will be f+ v+). 

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