Which of the following describes stabilizing selection?! Migration of individuals to an area with different conditions Prevents mutations from occurring Intermediate variants are favored in a population O Usually results in two distinct phenotypes

Which of the following describes stabilizing selection?! Migration of individuals to an area with different conditions Prevents mutations from occurring Intermediate variants are favored in a population O Usually results in two distinct phenotypes

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter19: Evolutionary Change In Populations

Section: Chapter Questions

Problem 10TYU: Which of the following is not true of natural selection? (a) natural selection acts to preserve...

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Concept explainers

Genetic Variation

Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.

Quantitative Genetics

Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.

Question

Which of the following describes stabilizing selection?!
Migration of individuals to an area with different conditions
Prevents mutations from occurring
Intermediate variants are favored in a population
Usually results in two distinct phenotypes

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Which of the following is not true of natural selection? (a) natural selection acts to preserve favorable traits and eliminate unfavorable traits (b) the offspring of individuals that are better adapted to the environment will make up a larger proportion of the next generation (c) natural selection directs the course of evolution by preserving the traits acquired during an individuals lifetime (d) natural selection acts on a populations genetic variability, which arises through mutation (e) natural selection may result in changes in allele frequencies in a population
Which of the following is an example of stabilizing selection?a. Over time, Equus developed strength, intelligence, speed,and durable grinding teeth.b. British land snails mainly have two different phenotypes.c. Swiss starlings usually lay four or five eggs, therebyincreasing their chances of more offspring.d. Drug resistance increases with each generation; theresistant bacteria survive, and the nonresistant bacteriaget killed off.e. All of these are correct
What is the role of variation in evolution. If heterozygosity is reduced, what happens to the potential for evolution?. The phenotype and genotype bof a population is die to a mosaic of random and directed processes, some of them have to do with history ;some are related to adaptation, etc. As completely as possible, discuss the role of chance and direction in evolution and in determining the phenotype of a population
One way for disruptive selection to occur is ifa. the population contains diversity.b. the environment contains diversity.c. pollution is present.d. natural selection occurs.e. All of these are correct.
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The equilibrium frequency of a deleterious allele under mutation-selection balance increases as: mutation rate increases strength of selection increases dominance increases none of the above
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What is the role of variation in evolution If heterozygosity is reduced what happens to the potential for evolution? The phenotype and genotype of a population is due to a mosaic of random and directed processes some of these have to do with history.some are related to adaptation etc. As completely as possible,discuss the role of chance and direction in evolution and in determining the phenotype of a population
The original source of new alleles, upon which selection operates,is mutation, a random event that occurs without regard to selectionalvalue in the organism. Although many model organismshave been used to study mutational events in populations, someinvestigators have developed abiotic molecular models. Soll et al.(2006. Genetics 175:267–275) examined one such model to studythe relationship between both deleterious and advantageousmutations and population size in a ligase molecule composed ofRNA (a ribozyme). Soll found that the smaller the population ofmolecules, the more likely it was that not only deleterious mutationsbut also advantageous mutations would disappear. Whywould population size influence the survival of both types ofmutations (deleterious and advantageous) in populations?
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