Campbell Biology: Concepts & Connections (8th Edition)
8th Edition
ISBN: 9780321885326
Author: Jane B. Reece, Martha R. Taylor, Eric J. Simon, Jean L. Dickey, Kelly A. Hogan
Publisher: PEARSON
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Chapter 13, Problem 6TYK
If an allele is recessive and lethal in homozygotes before they reproduce,
a. the allele will be removed from the population by natural selection in approximately 1,000 years.
b. the allele will likely remain in the population at a low frequency because it cannot be selected against in heterozygotes.
c. the fitness of the homozygous recessive genotype is 0.
d. both b and c are correct.
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Which of the following statements describes an example of genetic drift?a. Allele g for fat production increases in a small population because birds with more bodyfat have higher survivorship in a harsh winter.b. Random mutation increases the frequency of allele A in one population but not inanother.c. Allele R reaches a frequency of 1.0 because individuals with genotype rr are sterile.d. Allele m is lost when a virus kills all but a few individuals and just by chance, none ofthe survivors possess allele m.
A population of gophers is very isolated, so no individuals can move in/out of the population. It is very small, so random events affect allele frequencies and many traits are under strong selection. Males are chosen randomly. Which statement is correct?
A. Allele frequencies in 10 generations will be different than they are today.
B. Individual gophers are evolving traits they need to survive
C.Genetic drift is not acting on the gophers
D. The population is in Hardy-Weinberg equilibrium
Identify the most accurate statement about population variation.
a.
Allopolyploidy occurs when chromosomes fail to separate during gametogenesis and then self-fertilization results in a tetraploid offspring.
b.
Chromosomal duplications and deletions cause large changes due to the changes in gene dosage.
c.
Traits that are influenced by both environment and genetics are unlikely to be influenced by evolution.
d.
Gene duplications and deletions occur frequently during equal crossing over that occurs during meiosis I.
Chapter 13 Solutions
Campbell Biology: Concepts & Connections (8th Edition)
Ch. 13 - Summarize the key points of Darwins theory of...Ch. 13 - Complete this concept map describing potential...Ch. 13 - Which of the following did not influence Darwin as...Ch. 13 - Natural selection is sometimes described as...Ch. 13 - In an area of erratic rainfall, a biologist found...Ch. 13 - If an allele is recessive and lethal in...Ch. 13 - In a population with two alleles, B and b, the...Ch. 13 - Within a few weeks of treatment with the drug 3TC,...Ch. 13 - Prob. 9TYKCh. 13 - Write a paragraph briefly describing the kinds of...
Ch. 13 - In the early 1800s, French naturalist Jean...Ch. 13 - Sickle-cell disease is caused by a recessive...Ch. 13 - It seems logical that natural selection would work...Ch. 13 - SCIENTIFIC THINKING Cetaceans are fully aquatic...Ch. 13 - A population of snails is preyed on by birds that...Ch. 13 - Advocates of scientific creationism and...
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