Campbell Biology: Concepts.. (Custom Package)
8th Edition
ISBN: 9781323042649
Author: Central Texas
Publisher: PEARSON
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Chapter 13, Problem 5TYK
In an area of erratic rainfall, a biologist found that grass plants with alleles for curled leaves reproduced better in dry years, and plants with alleles for flat leaves reproduced better in wet years. This situation would tend to _____. (Explain your answer.)
a. cause genetic drift in the grass population.
b. preserve
c. lead to stabilizing selection in the grass population.
d. lead to uniformity in the grass population.
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In the 1900s, the Florida panther population declined drastically due to hunting and habitat loss, and, by the mid-1990s, there were fewer than 30 Florida panthers left in the wild. What were the most likely consequences of this decline in population size on the frequency of genetic abnormalities, such as malformed testicles, in the remaining population?
A. The frequency of genetic abnormalities decreased due to the weakest panthers being eliminated through natural selection.
B. The frequency of genetic abnormalities increased due to an increased rate of migration of other panthers into the population.
C. The frequency of genetic abnormalities increased due to the random loss of genetic diversity and increased inbreeding in small populations.
D. The frequency of genetic abnormalities decreased because the concentration of adaptive alleles in the small population decreased as the population declined.
With stronger natural selection, was the more beneficial allele lost from these small populations?a) It was lost very frequently, and the strength of natural selection did not make any difference.b) It was never lost.c) It was lost a few times, but not very often, and it was lost less frequently under strong selection.d) It was lost a few times, and it was lost more frequently under strong selection.
This model shows the process of natural selection on rabbits demonstrating variation in fur color over several generations. Using the model, what most likely led to the loss of white furred rabbits in the population?
A) the white rabbits did not reproduce fast enough to survive
B) white was a recessive trait and therefore not passed on to any offspring
C) the white fur was a favorable trait but was never prevalent in the population
D) the rabbits with white fur had less camouflage in the environment and were more easily preyed on by predators
Chapter 13 Solutions
Campbell Biology: Concepts.. (Custom Package)
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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