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
A defective gene on chromosome 15 causes Tay-Sachs disease. It is a central nervous system neurodegenerative disease that most often affects infants, though older children and adults can have late-onset forms of the disease. The defective gene prevents the body from making a protein called hexosaminidase A. Without, hexosaminidase A, chemicals called gangliosides build up in the nerve cells of the brain, destroying brain cells.
Pedigree information regarding the incidence of Tay-Sachs within a family is depicted above. The row below that indicates the genotypes of individuals II-1, II-2, and III-1 is
Select one:
a.
II-1 | II-2 | III-1 |
---|---|---|
Aa | Aa | aa |
b.
II-1 | II-2 | III-1 |
---|---|---|
XAY | XAXa | XAXa |
c.
II-1 | II-2 | III-1 |
---|---|---|
XAY | XAXA | XaXa |
d.
II-1 | II-2 | III-1 |
---|---|---|
AA | aa | Aa |

Transcribed Image Text:Pedigree of a Family with Tay-Sachs Disease
1
3
4
II
1
II
1 2
3
4
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