Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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Textbook Question
Chapter 15, Problem 15.2CR
Why are males affected by X-Iinked disorders much more often than females?
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Can a woman who is affected by an X-linked dominant disorder have a child who is not affected? Why or why not?
X-linked disorders (like hemophilia) are more likely to affect people of one gender than the other. Which gender is this, and why are x-linked disorders more likely to affect people of this gender?
Most individuals who have X-linked diseases are males because
O males have an extra Y chromosome.
males have an extra X chromosome, making them XXY.
O males have only one copy of the X chromosome.
O the diseases are triggered by the male sex hormone, testosterone.
Chapter 15 Solutions
Campbell Biology: Custom Edition
Ch. 15.1 - Which one of Mendel's laws describes the...Ch. 15.1 - MAKE CONNECTIONS Review the description of...Ch. 15.1 - WHAT IF? Propose a possible reason that the first...Ch. 15.2 - A white-eyed female Drosophila is mated with a...Ch. 15.2 - Neither Tim nor Rhoda has Duchenne muscular...Ch. 15.2 - MAKE CONNECTIONS Consider what you learned about...Ch. 15.3 - When two genes are located on the same chromosome,...Ch. 15.3 - VISUAL SKILLS For each type of offspring of the...Ch. 15.3 - Prob. 3CCCh. 15.4 - Prob. 1CC
Ch. 15.4 - Prob. 2CCCh. 15.4 - Prob. 3CCCh. 15.5 - Gene dosagethe number of copies of a gene that are...Ch. 15.5 - Reciprocal crosses between two primrose varieties,...Ch. 15.5 - WHAT IF? Mitochondrial genes are critical to the...Ch. 15 - What characteristic of the sex chromosomes allowed...Ch. 15 - Why are males affected by X-Iinked disorders much...Ch. 15 - Why are specific alleles of two distant genes more...Ch. 15 - Prob. 15.4CRCh. 15 - Explain how genomic imprinting and inheritance of...Ch. 15 - A man with hemophilia (a recessive, sex-linked...Ch. 15 - Pseudohypertrophic muscular dystrophy is an...Ch. 15 - A wild-type fruit fly (heterozygous for gray body...Ch. 15 - A planet is inhabited by creatures that reproduce...Ch. 15 - Using the information from problem 4, scientists...Ch. 15 - A wild-type fruit fly (heterozygous for gray body...Ch. 15 - Assume that genes, A and B are on the same...Ch. 15 - Two genes of a flower, one Controlling blue (B)...Ch. 15 - You design Drosophila crosses to provide...Ch. 15 - Banana plants, which are triploid, are seedless...Ch. 15 - EVOLUTION CONNECTION Crossing over is thought to...Ch. 15 - SCIENTIFIC INQUIRY DRAW IT Assume you are mapping...Ch. 15 - WRITE ABOUT A THEME: INFORMATION The continuity of...Ch. 15 - SYNTHESIZE YOUR KNOWLEDGE Butter flies have an X-Y...
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- An individual that is genetically male develops as a female. Is this individual more or less likely to express an X-linked recessive disorder than an average female?arrow_forwardIf a father is affected by an X-linked dominant condition and the mother is normal, what is the probability of their children being affected? All sons will be affected. Half of the sons will be affected. All daughters will be affected. Half of the daughters will be carriers.arrow_forwardExplain why X-linked recessive traits are often more common in males but X-linked dominant traits are often more common in females.arrow_forward
- What will be the sex of an individual who is easily affected by an X-linked recessive trait? Why?arrow_forwardWhy do X-linked recessive conditions appear most commonlyin males?arrow_forwardExplain the difference between X-linked recessive traits and X-linked dominant traits. What are the possibilities that a female child will be affected and express each of the traits?arrow_forward
- Under what conditions does a female acquire anX-linked recessive disorder?arrow_forwardIncontinentia pigmenti, a rare, X-linked dominant disorder inhumans, is characterized by swirls of pigment in the skin. If anaffected female, who had an unaffected father, has children with anunaffected male, what are the predicted ratios of affected andunaffected sons and daughters?arrow_forwardWho is a carrier of an X-linked trait? homozygous male homozygous dominant female heterozygous female heterozygous male homozygous recessive femalearrow_forward
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