Answered: P generation F, generation Patch of…

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

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question

Anhidrotic ectodermal dysplasia is an X-linked recessive disorder in
humans characterized by small teeth, no sweat glands, and sparse body
hair. This trait is usually seen in men, but women who are heterozygous
carriers of the trait often have irregular patches of skin with few or no
sweat glands (see the illustration below).
a. Explain why women who are heterozygous carriers of a recessive gene
for anhidrotic ectodermal dysplasia have irregular patches of skin lacking
sweat glands.
b. Why does the distribution of the patches of skin lacking sweat glands
differ among the females depicted in the illustration, even between the
identical twins?

P generation
F, generation
Patch of skin
lacking sweat
glands
F2 generation
F3 generation
Identical twins

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