Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
12th Edition
ISBN: 9780135755785
Author: Gerald Audesirk, Teresa Audesirk
Publisher: PEARSON+
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Chapter 11, Problem 4MC
Summary Introduction

Introduction:

In sex-linked inheritance, the genes are associated with one of the sex chromosomes; either on X or Y. Most of the sex-linked chromosomes are associated with X chromosome, as it has longer arms which can bear number of genes.

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In mammals, males have X and Y sex chromosomes, while females have two Xs. While the Y sex chromosome has very few genes associated with it, the X sex chromosome has many that are important to maintain life. How do mammals account for this in terms of equaling out gene expression levels? A. Mammals do not need to account for this, but birds do. B. Females produce more proteins from X-linked genes than males do. C. The single X of the males works twice as hard to keep up with the female’s two Xs. D. The females have one X inactivated to permit the males to keep pace with them.
In organisms with X and Y chromosomes, many more genes can be found on the X chromosome than on the Y chromosome. In mammals, how might this deviate from traits being expressed, according to Mendel?   A. Females might exhibit a mix of traits rather than all dominant or all recessive traits.   B. Only females will have the traits resulting from the X-linked genes.   C. Females will overproduce some proteins in relation to males’ production levels.   D. This will not result in individuals deviating from Mendel’s principles.
Which of the following is not a characteristic of X-linked recessive traits in humans?   a. Approximately one-half of the sons of a female carrier are affected.   b. More males than females affected.   c. Phenotypically normal daughters of affected men are always carriers.   d. They cannot be passed from father to son.   e. Affected daughters always have an affected mother.

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Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)

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