Which form of microevolution involves the movement of alleles into or out of a population?

Which form of microevolution involves the movement of alleles into or out of a population?

Understanding:

•  A gene pool consists of all the genes and their different alleles, present in an interbreeding population

    
Gene Pools

A gene pool represents the sum total of alleles for all genes present in a sexually reproducing population

  • A large gene pool indicates high amounts of genetic diversity, increasing the chances of biological fitness and survival
  • A small gene pool indicates low amounts of genetic diversity, reducing biological fitness and increasing chances of extinction


Gene pools can be used to determine allele frequency – the proportion of a particular allele within a population

Representation of a Gene Pool

Which form of microevolution involves the movement of alleles into or out of a population?

Which form of microevolution involves the movement of alleles into or out of a population?

Understanding:

•  Evolution requires that allele frequencies change with time in populations

    
Evolution is the cumulative change in the heritable characteristics of a population across successive generations

  • This requires that allele frequencies change within the gene pool of the population to reflect these evolving characteristics

Mechanisms of Change

Changes to allele frequency within a gene pool (evolution) can result from five key processes:

  • Mutation:  A random change in the genetic composition of an organism due to changes in the DNA base sequence
  • Gene flow:  The movement of alleles into, or out of, a population as a result of immigration or emigration
  • Sexual reproduction:  Sex can introduce new gene combinations and alter allele frequencies if mating is assortative
  • Genetic drift:  The change in the composition of a gene pool as a result of a chance or random event
  • Natural selection:  The change in the composition of a gene pool as a result of differentially selective environmental pressures

Mechanisms for Changing Allele Frequency within a Gene Pool

Which form of microevolution involves the movement of alleles into or out of a population?

TedEd Talks:  The Five Fingers of Evolution

Which form of microevolution involves the movement of alleles into or out of a population?

Which form of microevolution involves the movement of alleles into or out of a population?

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What is the movement of alleles into or out of a population?

Gene flow is the movement of genes into or out of a population. Such movement may be due to migration of individual organisms that reproduce in their new populations, or to the movement of gametes (e.g., as a consequence of pollen transfer among plants).

What is the term for the movement of alleles into or out of a population through immigration and emigration?

Gene flow is the transfer of alleles from one population to another population through immigration of individuals.

Is the flow of alleles in and out of a population?

An important evolutionary force is gene flow: the flow of alleles in and out of a population due to the migration of individuals or gametes. While some populations are fairly stable, others experience more movement and fluctuation.

What are the three types of microevolution?

9.4: Microevolution.
Genetic Drift..
Mutation..
Gene Flow..
Natural Selection. Feature: Human Biology in the News..