Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 20.2, Problem 4R
Summary Introduction
To review:
The reason behind slowing down of the evolutionary process due to gene flow.
Introduction:
The gene flow can be defined as the exchange and the movement of the genetic material from one population of the species to another. This flow of gene can take place in between two interbreeding population. It is basically the concept in population genetics, which refers to the flow of genes between the interbreeding population of one species.
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Students have asked these similar questions
What is gene flow defined as?
Group of answer choices
A-production of new alleles
B-chance loss of alleles in a population
C-exchange of genes between populations
D-production of new genetic material
E-differential reproductive success of individuals
What does "gene flow" between populations do?
write in 5 paragraphs
What processes could cause a population to evolve? How does a single population evolve over time?
Chapter 20 Solutions
Life: The Science of Biology
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- Mutations are the ultimate source of genetic variation. Consider a population of 500 diploid individuals. If a mutation resulting in a single copy of a novel allele occurred in a gene in one individual, what is the frequency of the new allele in the population? 0.05 0.000001 0.001 0.005 0.002arrow_forwardAssume you are studying a population of ocean shrimp that reproduce asexually. You sequence the ocean shrimp and the species that is their closest living relative that reproduces sexually. You find that the asexually reproducing species has a higher number of mutations in the genome. This finding would provide support for which of the following ideas? Linkage disequilibrium Stabilizing selection Disruptive selection Muller's ratchetarrow_forwardWhich of the following is an effect of gene flow? Population size is greatly reduced Individuals establish a new population Natural disasters Genetic differences between populations are reducedarrow_forward
- How can gene flow impact a population's allele frequencies? Choose one of the following: By causing mutations in the DNA By introducing new alleles through migration By wiping out a large proportion of the populationarrow_forwardBelow is a life table for a hypothetical organism. What is the expected lifetime reproductive success for individuals carrying the A1 allele? (Note: RS: reproductive success) Question 3 options: 2.35 2.50 2.64 3.66 24.00 Follow up on the previous question. If a mutation occurred such that A2 allele appeared in this population. The new allele has the effect of reproducing one year earlier but at the cost of not being able to reproduce after age 6. Can A2 allele be selected for and subsequently fixed in the population? Question 4 options: Yes, because A2 allele exhibits the antagonistic pleiotropic effect. Yes, because carriers of the A2 allele have a higher expected lifetime reproductive success than the individuals carrying the A1 allele. No, because carriers of the…arrow_forwardSuppose a very small group of birds serves as the foundation of a new population. As a result, the population is very genetically homogeneous. What phenomenon has affected this population? O a) Mutation O b) Gene flow Oc) Non-random mating O d) Genetic driftarrow_forward
- Gene flow often increases genetic diversity of populations that come together. Which of these is an example of when gene flow could reduce genetic diversity if two populations (Population A and Population B) come together? O The offspring with parents from population A and B have low survival because they are not adapted to the environment. O Individuals from population A have an allele that is not found in population B. O Individuals from population B have an allele that is not found in population B O Population A only has homozygous recessive alleles and population B only has homozygous dominant alleles.arrow_forwardBASED ON THIS GRAPH: A small community that is heavily infested with mosquitoes was sprayed weekly with the insecticide DDT for several months. Daily counts providing information on mosquito population size are represented in the graph below. Provide a biological explanation for the changes in the mosquito population over time. Use the terms: insecticide resistance/resistant, natural selection, favorable trait, reproduce, mutation/sexual reproductionarrow_forwardWhat processes affect the composition of a population’s gene pool?arrow_forward
- What does gene flow between population doarrow_forwardHow does gene flow affect coevolution? For example, there is a coevolutionary arms race between snakes and newts. Snakes try to eat newts but they end up dying due to the newts' proudction of a toxin (TTX). In response, snakes have adapted a greater resistance to the toxin allowing them to not die. What would the factor of gene flow do to a population like this??arrow_forwardIn a certain population, there exists a recessive disease which causes death by the age of 5 years. You study this population and discover that all the homozygous recessive individuals have died. Two years later, you find homozygous recessive individuals are back in the population. There has been no gene flow, so from where did these individuals come?arrow_forward
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