Which of the following statements correctly describes the conditions of microevolution? Select one: a. Mutations happen randomly, and the environment provides selective pressure. b. Mates are chosen based on specific traits, and the bottleneck effect is prevented. c. Genes to flow from one population to another, and random mating occurs. d. The population is closed, and individuals are not allowed to immigrate or emigrate

Which of the following statements correctly describes the conditions of microevolution? Select one: a. Mutations happen randomly, and the environment provides selective pressure. b. Mates are chosen based on specific traits, and the bottleneck effect is prevented. c. Genes to flow from one population to another, and random mating occurs. d. The population is closed, and individuals are not allowed to immigrate or emigrate

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter11: Evolution And Its Processes

Section: Chapter Questions

Problem 7RQ: In which of the following pairs do both evolutionary processes introduce new genetic variation into...

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Which of the following examples refers to microevolution? A.In a population of mice, individuals with dark fur are cryptic against the dark soil in their habitat and have higher fitness. Many generations later, the proportion of the population with the allele for dark fur has increased B. Two populations of the same species are reproductively isolated (no allels/individual , moving between the populations) Over many generations they become so different that they diverge into separate species C.In a population of lizards, a random event causes one allele to be lost from the population. So, future generations have a lower proportion (zero) of that alele.
What is true of populations that are in Hardy-Weinberg equilibrium? a. Organisms are constantly migrating. b. Mating is random. c. The populations must be very small. d. Natural selection is occurring.
In which of the following pairs do both evolutionary processes introduce new genetic variation into a population? a. natural selection and genetic drift b. mutation and gene flow c. natural selection and gene flow d. gene flow and genetic drift
Galapagos medium ground finches are found on Santa Cruz and San Cristóbal islands, which are separated by about 100 km of ocean. Occasionally, individuals from either island fly to the other island to stay. This can alter the allele frequencies of the population through which of the following mechanisms? a. natural selection b. genetic drift c. gene flow d. mutation
INTERPRET DATA The genotype frequencies of a population are determined to be 0.6 BB. 0.0 Bb, and 0.4 bb. Is it likely that this population meets all the conditions required for genetic equilibrium?
In the Grants’ study of the medium ground finch, do you think the pattern of natural selection was directional, stabilizing, disruptive, or balancing? Explain your answer. If the environment remained dry indefinitely (for many years), what do you think would be the long-term outcome?
Which of the following evolutionary forces can introduce new genetic variation into a population? a. natural selection and genetic drift b. mutation and gene flow c. natural selection and nonrandom mating d. mutation and genetic drift
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Should you simulate gene flow (that is, the introduction of “outside” cats and their alleles into your “base” cat population)? If so, what would be a reasonable migration rate? What would be the frequency of the PKD allele in that “outside”/migrant population?
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If you measured the allele frequencies of a gene and found large differences from those predicted by the Hardy–Weinberg principle, would that prove that natural selection is occurring in the population you are studying? Review the conditions that lead to an equilibrium population, and explain your answer.
a. What effect does combining genetic drift and natural selection have on beneficial mutations? b. How would you it change if population size increases