Which of these statements is correct? Genetic variation is not random and natural selection is random. Both natural selection and genetic variation are directed processes. Genetic variation is random and natural selection is not random. Both genetic variation and natural selection are random processes. Natural selection is directed and genetic variation is not directed.

Which of these statements is correct? Genetic variation is not random and natural selection is random. Both natural selection and genetic variation are directed processes. Genetic variation is random and natural selection is not random. Both genetic variation and natural selection are random processes. Natural selection is directed and genetic variation is not directed.

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter19: Population Genetics And Human Evolution

Section: Chapter Questions

Problem 19QP: Measuring Genetic Diversity in Human Populations The theory of natural selection has been summarized...

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QUESTION 1 Which of the following statements is true? a. Evolution is a completely random process. b. Evolution is synonymous with natural selection. c. Evolution only occurs in individuals. d. Evolution is defined as change in allele frequencies over time.
Question 20 How do new species arise, according to the theory of natural selection? when an old species goes extinct, a new species arises to take its place ) individuals in a population pass on new traits they have acquired during their lifetimes (3) two new species spontaneously branch off from ancestor populations from time to time if a population is reproductively isolated in a sufficiently different ecosystem for an extended period of time, it will develop adaptations that will eventually render it incapable of interbreeding with its host population
Question 18 When fitness is lower at both extremes of phenotypic variation for a trait (e.g., the very largest and very smallest beaks in a bird population) than for the median value in a population, the predominant evolutionary force at work is called Group of answer choices Only 1 correct answer phenotypic selection stabilizing selection directional selection phenotypic choice
Question 4: What percentage or Americans believe that evolution does not occur and that humans and all other living things have only ever existed in their present form? A. Less than 20%B. Between 20% and 40%C. Between 40% and 60%D. Between 60% and 80%E. More than 80%
QUESTION 46 Which of the following statements about speciation is correct? a. Natural selection chooses the reproductive barriers for populations b. It always takes millions of years for speciation to occur c. The goal of natural selection is speciation d. Speciation is a process in which members become reproductively isolated into their own group.
QUESTION 30 Misconceptions (false-truths accepted by the general public) are a constant problem in terms of evolution education. Of the following statements, which one is actually TRUE? a. Natural selection only acts directly on phenotypes of individuals. b. Populations must evolve to avoid and prevent extinction of the species. c. Populations evolve to perfection such that all traits an individual has maximizes all aspects of fitness. d. A new trait cannot evolve within a population while undergoing selection favoring a different trait.
Question 2 please: Does natural selection always lead to evolution? Use the information in this activity to answer that question. What more might we need to know to fully answer it?
Question- How is genetic drift different from natural selection? choose one from below 1. Natural selection occurs because some alleles confer higher fitness, whereas genetic drift occurs because of sampling error 2. natural selection has a stronger effect in large populations, whereas genetic drift acts primarily in small populations 3. natural selection is a mechanisms of evolution, whereas genetic drift is not a mechanisms but an outcome of evolution 4. natural selection tends to cause very rapid evolution, whereas genetic drift tends to operate on much longer time scales.
QUESTION 11 You are examining a new population that has recently migrated to and colonized a new island. Which of the following characteristics would you expect to see in your population? a. The new population will likely experience genetic drift related issues related to the founder effect. b. The new population will suffer more the effects of mutation because this is a bottleneck event. c. The new population will have high levels of heterozygosity and allelic richness. d. The new population will most likely have the same allele frequencies as the original population.
QUESTION 3 Which of the following is a false statement about the Hardy-Weinberg Principle? a. It needs a large population b. No mutations or natural selection of an allele can occur c. It requires a random mating population. d. Migration is essential to maintain allelic frequency
QUESTION 16 You are examining a beloved population of trillium in the backyard of your childhood home. You recall as a child that flowers were bright white. As you return to the population you note that many (but not all) of the flowers have a faint purple vertical stripe in the middle of each petal. List each of Darwin’s postulates and what must be true about your population if it has undergone evolution by natural selection for petal color.
Measuring Genetic Diversity in Human Populations The theory of natural selection has been summarized popularly as survival of the fittest. Is this an accurate description of natural selection? Why or why not?