BIOL 1407 - Ch 19 Questions With Complete Solutions
___ is the ultimate source of genetic variation. Correct Answers
Mutation
___ selection acts to prevent change away from an already
common intermediate phenotype. Correct Answers Stabilizing
___ selection is a type of natural selection in which competition
for mates drives the evolution of certain traits. Correct Answers
Sexual
A characteristic that confers a survival advantage Correct
Answers is likely to also increase reproductive success and, as a
consequence, favored by natural selection.
A deer's antlers, a ram's horns and the bright plumage of a male
paradise bird are all examples of which of the following?
Correct Answers Secondary sexual characteristics
A dramatic reduction in population size due to a natural disaster
or destruction of habitat and the resulting change in the allele
frequencies of the new population is called Correct Answers
the bottleneck effect.
A type of natural selection called ___ selection favors different
phenotypes at different times and maintains ___ variation in
populations. Correct Answers oscillating; genetic
After Mendel's work was rediscovered, what scientists explained
why a population doesn't always come to be composed solely of
, individuals with the dominant phenotype? Correct Answers
Hardy and Weinberg
By favoring different phenotypes at different times, oscillating
selection acts in which way? Correct Answers It maintains
genetic variation in a population.
Choose all the components of fitness from the list below:
Correct Answers -Mating success
-Individual survival
-Production of viable, numerous offspring
Consider a gene with two alleles, one dominant, and the other
recessive. If this population is in Hardy-Weinberg equilibrium
with respect to this gene, what would happen to the dominant
allele from generation to generation? Correct Answers Its
frequency will remain unchanged
Consider two populations of the same plant species - population
A and population B and the gene Xx. Researchers discover that
there is constant flow of the x allele from population B into
population A. This allele happens to be detrimental to
individuals in population A because of the local soil conditions.
This is an example of Correct Answers gene flow opposing
natural selection.
Darwin proposed that the mechanism of evolution is Correct
Answers natural selection.
Directional selection Correct Answers acts to eliminate one
extreme from a range of phenotypes.
___ is the ultimate source of genetic variation. Correct Answers
Mutation
___ selection acts to prevent change away from an already
common intermediate phenotype. Correct Answers Stabilizing
___ selection is a type of natural selection in which competition
for mates drives the evolution of certain traits. Correct Answers
Sexual
A characteristic that confers a survival advantage Correct
Answers is likely to also increase reproductive success and, as a
consequence, favored by natural selection.
A deer's antlers, a ram's horns and the bright plumage of a male
paradise bird are all examples of which of the following?
Correct Answers Secondary sexual characteristics
A dramatic reduction in population size due to a natural disaster
or destruction of habitat and the resulting change in the allele
frequencies of the new population is called Correct Answers
the bottleneck effect.
A type of natural selection called ___ selection favors different
phenotypes at different times and maintains ___ variation in
populations. Correct Answers oscillating; genetic
After Mendel's work was rediscovered, what scientists explained
why a population doesn't always come to be composed solely of
, individuals with the dominant phenotype? Correct Answers
Hardy and Weinberg
By favoring different phenotypes at different times, oscillating
selection acts in which way? Correct Answers It maintains
genetic variation in a population.
Choose all the components of fitness from the list below:
Correct Answers -Mating success
-Individual survival
-Production of viable, numerous offspring
Consider a gene with two alleles, one dominant, and the other
recessive. If this population is in Hardy-Weinberg equilibrium
with respect to this gene, what would happen to the dominant
allele from generation to generation? Correct Answers Its
frequency will remain unchanged
Consider two populations of the same plant species - population
A and population B and the gene Xx. Researchers discover that
there is constant flow of the x allele from population B into
population A. This allele happens to be detrimental to
individuals in population A because of the local soil conditions.
This is an example of Correct Answers gene flow opposing
natural selection.
Darwin proposed that the mechanism of evolution is Correct
Answers natural selection.
Directional selection Correct Answers acts to eliminate one
extreme from a range of phenotypes.
