Answered: The genetic variability of the Giddings…

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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The genetic variability of the Giddings children started out as
mutations that occurred thousands of years ago. Take hair
color: Our distant ancestors probably all had dark hair, its color
controlled by multiple genes located on several different chromosomes.
The alleles that produced Tess’s blond hair originated
as mutations in genes that control the amount and type of hair
pigment. Tess probably inherited only “pale hair” alleles of all of
these genes, so for any given hair color gene, she has the same
pale hair allele on both homologous chromosomes. Chris, on the
other hand, inherited both dark and pale hair alleles for at least
some of the genes, so his homologues have different alleles. As
we will see in Chapter 11, in many cases one allele (in this case,
the dark hair allele) overrides the effects of the other allele (the
pale hair allele), so Chris has black hair. What combinations of
alleles might have been packaged in Tess’s eggs and Chris’s
sperm, which would combine to produce their diverse children?

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