The rate of increase in frequency of a beneficial allele by positive selection depends on which...
The rate of increase in frequency of a beneficial allele by positive selection depends on which of the following?
Select one:
a. The selection coefficient and the amount of variation
b. The selection coefficient
c. The amount of variation
d. The selection coefficient and the type of phenotypic selection
e. The amount of variation and the type of phenotypic selection
Homework Answers
The answer is option d
d)The selection coefficient and the type of phenotypic selection.
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The rate of increase in frequency of a beneficial allele by
positive selection depends on which...
In the case of directional selection, if the advantageous allele (b) is recessive and a less...
In the case of directional selection, if the advantageous allele (b) is recessive and a less advantageous allele (B) is dominant: A. b will be lost in the population because the dominant allele will increase in frequency by natural selection B. b will increase in frequency at the same speed as if it was a dominant advantageous allele, because what matters is the coefficient of selection and not if the allele is dominant or recessive C. b will increase in...
6. Which of these conditions will lead to evolution by natural selection? a. Heavy metal pollution...
6. Which of these conditions will lead to evolution by natural selection? a. Heavy metal pollution reduces reproductive success of all phenotypes of green algae in the pond. b. Variation among individuals is not genetic; instead it results from learned behavior or physiological environmental responses. c. Introduction of an exotic predator species results in one native prey phenotype evading predation while other phenotypes get eaten. d. Individuals of the population are clones (genetically identical). 7. Which one is used as...
balancing selection Which of the following is an incorrect statement about balancing selection? A. Regardless of...
balancing selection
Which of the following is an incorrect statement about balancing selection? A. Regardless of the initial frequency of an allele, its frequency will eventually reach the same equilibrium frequency under balancing selection B. Balancing selection can maintain genetic variation even when mutation is absent. C. For a biallelic locus with alleles A1 and A2, balancing selection occurs when genotype A1A2 has the highest fitness. D. Balancing selection could occur at a locus on the Y chromosome
The response of a change in allele frequency to selection may vary as a function of...
The response of a change in allele frequency to selection may vary as a function of the nature of the gene’s expression. Of the system’s below, which would be the most responsive to selective pressure? a. Dominant alleles. b. Recessive alleles. c. Alleles with additive effects. d. None of the above.
________ unemployment changes slowly and depends on ________. Select one: a. Frictional; the rate at which...
________ unemployment changes slowly and depends on ________. Select one: a. Frictional; the rate at which people enter and exit the labor force b. Seasonal; the rate at which people enter and exit the labor force c. Frictional; the skills of the unemployed d. Structural; the inflation rate e. Structural; the rate at which people enter the labor force --------- An increase in nominal GDP could result from an increase in i. production. ii. prices. iii. subsidies. Select one: a....
(2) . I have two populations where the selection coefficient is the same but the initial...
(2) . I have two populations where the selection coefficient is the same but the initial frequency of the dominant allele (p) differs. In one population the initial frequency of the dominant allele (p) is much smaller than the other. The population with the smaller initial p frequency will reach 80% frequency of the dominant allele ____________________________ than the one with the smaller selection coefficient. (a) faster (fewer generations) needed for large changes in phenotype or allele frequencies in more...
Sickle-cell anaemia is an example of how fitness depends on environmental conditions. In places where malaria,...
Sickle-cell anaemia is an example of how fitness depends on environmental conditions. In places where malaria, caused by Plasmodium falciparum is common, HbAHbS heterozygotes have a selective advantage compared to individuals who are homozygotes for the wild type allele. However, HbSHbS homozygotes suffer from sickle-cell anaemia and usually die before producing offspring. The relative fitness (w) of the three genotypes in Nigeria are: HbAHbA 0.78, HbAHbS 1.0 HbSHbS 0.07 a. What is the mathematical relationship between relative fitness and selection...
2. Which of the following correctly describes how inbreeding will affect genotype and allele frequencies in...
2. Which of the following correctly describes how inbreeding will affect genotype and allele frequencies in Hardy-Weinberg populations? Genotype and allele frequencies will be unaffected. The frequency of heterozygotes will decrease, but allele frequencies will be unaffected. The frequency of homozygotes will increase, and deleterious alleles will decrease. Beneficial alleles will increase in frequency, as well as the genotypes containing those alleles. Genotype frequencies will return to H-W expectations after 1 generation of random mating. 3. Consider a population with...
Which type of genotypic selection leads to a stable equilibrium of polymorphism at a locus? Select...
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Which of the following accurately describes natural selection? A) Natural selection acts on pre-existing variation in...
Which of the following accurately describes natural selection? A) Natural selection acts on pre-existing variation in a population. B) Natural selection occurs when individuals shift to a different phenotype better suited to their novel environment. C) Populations become better adapted to novel environments as individuals with beneficial phenotypes reproduce more than others without that phenotype. D) Two of the above are correct. E) All of the above are correct.
6. Which of these conditions will lead to evolution by natural selection? a. Heavy metal pollution reduces reproductive success of all phenotypes of green algae in the pond. b. Variation among individuals is not genetic; instead it results from learned behavior or physiological environmental responses. c. Introduction of an exotic predator species results in one native prey phenotype evading predation while other phenotypes get eaten. d. Individuals of the population are clones (genetically identical). 7. Which one is used as...
balancing selection
Which of the following is an incorrect statement about balancing selection? A. Regardless of the initial frequency of an allele, its frequency will eventually reach the same equilibrium frequency under balancing selection B. Balancing selection can maintain genetic variation even when mutation is absent. C. For a biallelic locus with alleles A1 and A2, balancing selection occurs when genotype A1A2 has the highest fitness. D. Balancing selection could occur at a locus on the Y chromosome
2. Which of the following correctly describes how inbreeding will affect genotype and allele frequencies in Hardy-Weinberg populations? Genotype and allele frequencies will be unaffected. The frequency of heterozygotes will decrease, but allele frequencies will be unaffected. The frequency of homozygotes will increase, and deleterious alleles will decrease. Beneficial alleles will increase in frequency, as well as the genotypes containing those alleles. Genotype frequencies will return to H-W expectations after 1 generation of random mating. 3. Consider a population with...
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