Explain why dead females are never found in the F1 generation no matter which parents are crossed.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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A mutant sex-linked trait called “notched” (N) is deadly in Drosophila when homozygous in females. Males who have a single N allele will also die. The heterozygous condition (Nn) causes small notches on the wing. The normal condition in both male and females is represented by the allele n.


a) Indicate the phenotypes of the F1 generation from the following cross: XNXn x XnY

b) Explain why dead females are never found in the F1 generation no matter which parents are crossed.

c) Explain why the mating of female XNXn and a male XNy is unlikely.

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