AP BIOLOGY

EVOLUTION

EVOLUTION OF A POPULATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Immigration and emigration are examples of
A
gene flow.
B
genetic drift.
C
bottleneck.
D
founders effect.
Explanation: 

Detailed explanation-1: -Gene flow is also called gene migration. Gene flow is the transfer of genetic material from one population to another. Gene flow can take place between two populations of the same species through migration, and is mediated by reproduction and vertical gene transfer from parent to offspring.

Detailed explanation-2: -Genetic flow, also called gene migration, is the transfer of genes between different populations through migration. Immigration is when new organisms join a population, changing allele frequencies. Emigration is when members of a population leave, taking with them their genes.

Detailed explanation-3: -Emigration happens when genetically unique organisms leave one population for another. It is another form of gene flow, but it usually results in decreased genetic diversity. This is because rare alleles leave the existing gene pool.

Detailed explanation-4: -Migrants change the distribution of genetic diversity among populations, by modifying allele frequencies (the proportion of members carrying a particular variant of a gene). High rates of gene flow can reduce the genetic differentiation between the two groups, increasing homogeneity.

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