Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 26, Problem 4TYK
What does it mean when an allele reaches “fixation”?
a. It is eliminated from the population.
b. It has a frequency of 1.0.
c. It is dominant to all other alleles.
d. It is adaptive.
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Chapter 26 Solutions
Biological Science
Ch. 26 - PROCESS OF SCIENCE In what sense is the...Ch. 26 - 2. Why isn’t inbreeding considered an evolutionary...Ch. 26 - 3. CAUTION Why is genetic drift aptly named?
a. It...Ch. 26 - Prob. 5TYKCh. 26 - 5. QUANTITATIVE In a population of 2500, how many...Ch. 26 - 7. CAUTION Determine what is incorrect in the...Ch. 26 - Prob. 12TYUCh. 26 - QUANTITATIVE In humans, albinism is caused by...Ch. 26 - What does it mean when an allele reaches fixation?...Ch. 26 - Prob. 6TYK
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Suppose a population of 1000 people is in H-W equilibrium, if 84% of this population can taste PTC, how many are heterozygotes, considering that ability to taste PTC is inherited as a dominant allele?A. 480B. 400C. 580arrow_forwardWhich statement best summarizes why genetic drift tends to impact small populations more than large populations? A. Small populations have a heterozygote advantage because heterozygotes are more common than homozygotes. B. Small populations have a smaller gene pool, so random changes influence them more. C. Small populations have a relatively large gene pool, so the founder effect stabilizes their alleles.D. Small populations tend to experience directional selection, making one phenotype more common.arrow_forwardSome females seem to prefer the green colouration and some females seem to prefer the blue colouration. What type of selection is this an example of? a. stabilizing b. balancing c. directional d. diversifyingarrow_forward
- In general, what is the effect of complete selection, migration and random genetic drift on the gene frequencies of the population? a. complete selection b. migration c. random genetic driftarrow_forwardWe observe disruptive selection when the extreme values of a trait such as light and dark coat colors are selected for instead of a medium coat color? A. true b. Falsearrow_forwardAllele frequency refers to the fraction of individuals with a particular version of a given gene.What effect does natural selection have on the allele frequency of a population? A. It causes the allele frequency to resemble that of a small number of individuals that became separated from the rest of the population. B. It causes random changes and the allele frequency of certain traits may increase or decrease. C. It increases the frequency of alleles that improve a species' survival in a particular environment. D. It greatly reduces the total population, which increases the effects of genetic drift on allele frequency.arrow_forward
- What is the main cause of genetic variation between identical twins? A. genetic drift B. the movement of alleles through sexual reproduction C. mutations generated in the previous generation D. geographic variation within a population E. environmental effectsarrow_forwardSuppose a population of mice is subject to a few years of very cold, dry winters that drastically decreases their numbers. After the decrease in population size, there was a population of 200 mice, with 182 showing the dominant long tail phenotype and 18 showing the recessive short tail phenotype. a. What is the frequency of the recessive allele? b. What is the frequency of the dominant allele?arrow_forwardWhich type of selection results in greater genetic variance in a population? a. stabilizing selection b. directional selection c. diversifying selection d. positive frequency-dependent selectionarrow_forward
- What is the greatest source of genetic variation in plant and animal populations? a. Geographic variation b. Recessive masking in heterozygotes c. Selection d. Sexual reproductionarrow_forwardA subpopulation of a species of birds migrates to a different location from the rest of the species for breeding purposes. How might the genes change in the subpopulation? A. Their genes would change randomly and eventually revert to normalcy, which would allow the subpopulation to return to the main population. B. Their genes would change to better allow them to survive and reproduce in their new location. C. Their genes would not change at all and they would merely be a subpopulation living in a different location. D. Their genes would change so that they would continue to be well-adapted to their former location.arrow_forwardWhich statement about Inbreeding (=consanguinity) is correct? a. Inbreeding has no influence on the degree of homozygosity. b. Inbreeding increases the frequency of homozygotes in a population. c. Inbreeding improves the overall biological fitness of progeny. d. Inbreeding increases the frequency of heterozygotes in a population.arrow_forward
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