Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 23, Problem 14TYK
Cystic fibrosis is a very serious genetic disorder that occurs in homozygotes for a recessive allele. Although the disease is extremely serious, this recessive allele appears with surprisingly high frequency in Caucasian populations. It has been suggested that siblings of individuals with cystic fibrosis may have some protection from certain bacterial infections of the gut. If this is true, then the recessive allele is maintained at high frequency by
- a. the founder effect.
- b. new mutations.
- c. heterozygote advantage.
- d. frequency-dependent selection.
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Among a large population of 2 million gray mosquitoes, one mosquito is heterozygous for a body color gene; this mosquito has one gray allele and one blue allele. There is no selective advantage or disadvantage between gray and blue body color. All of the other mosquitoes carry two copies of the gray allele.
A. What is the probability of fixation of the blue allele?
B. If fixation happens to occur, how many generations is it likely to take?
C. Qualitatively, how would the answers to parts A and B be affected if the blue allele conferred a slight survival advantage?
Consider the case of a hypothetical genetic disease called WhySciEleven (WSE), an inherited disease that results to the inability to complete production of an amino acid “moduleactivity” that results in brain damage if untreated. WSE is due to a recessive allele. Given one WSE occurrence per 10,000 births.
Which term in the Hardy-Weinberg equation corresponds to the frequency of individuals who have no alleles for the disease WSE?
a. p
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c. p2
d. q2
A farmer performs truncation selection to try to increase the weight of peaches in his orchard. Which statement correctly describes a possible outcome of this selection?
a) If peach weight is not heritable, the average weight in the next generation will increase.
b) If peach weight is heritable, the average weight in the next generation will increase.
c) The average peach weight will decrease due to this inbreeding.
If peach weight is heritable, the average weight in the next generation will decrease.
Chapter 23 Solutions
Study Guide for Campbell Biology
Ch. 23 - a. What is a major source of genetic variation for...Ch. 23 - In a population of 200 mice, 98 are homozygous...Ch. 23 - Use the allele frequencies you determined in...Ch. 23 - Practice using the Hardy-Weinberg equation so that...Ch. 23 - Prob. 5IQCh. 23 - Why hasnt the highly deleterious sickle-cell...Ch. 23 - a. What is Hardy-Weinberg equilibrium? b. Define...Ch. 23 - Prob. 2SYKCh. 23 - Prob. 1TYKCh. 23 - Prob. 2TYK
Ch. 23 - Prob. 3TYKCh. 23 - Prob. 4TYKCh. 23 - Mice have an estimated 1,000 olfactory receptor...Ch. 23 - Prob. 6TYKCh. 23 - If a population has the following genotype...Ch. 23 - In a population with two alleles, B and b, the...Ch. 23 - Prob. 9TYKCh. 23 - Prob. 10TYKCh. 23 - In a random sample of a population of shorthorn...Ch. 23 - Genetic drift is likely to be seen in a population...Ch. 23 - Porphyria variegata is a genetic disease...Ch. 23 - Cystic fibrosis is a very serious genetic disorder...Ch. 23 - Prob. 15TYKCh. 23 - Prob. 16TYKCh. 23 - Prob. 17TYKCh. 23 - Prob. 18TYKCh. 23 - Prob. 19TYKCh. 23 - Prob. 20TYKCh. 23 - Prob. 21TYK
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