Question

How do each of these reduce genetic diversity (how they occur/function) (give examples or goo hypothesised examples)

a. natural selection

b. genetic covariance

c. phenotypic plasticity

d. genetic drift

Answer 1

Answer=

a] natural selection = Natural selection can decrease genetic diversity in populations of organisms by selecting for or against a specific gene or gene combination leading to directional selection.

b]genetic covariance- of genetically determined traits are arises when genetic differences among populations cause only certain combinations of traits to occur in populations.

c]phenotypic plasticity - occurs at the individual level by changing the phenotype depending on the environment.

By reducing the response to selection,phenotypic plasticity may promote the maintenance of genetic diversity within a population.

For a given trait change with environment can be continuous or discrete.

d] genetic drift -occurs in small populations ,where infrequently occuring alleles face a greater chance or being lost.