Microevolution is defined as a change in _______in a population over a relatively short period of time.

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Related Questions

What common misconceptions about nature result from the phrase “survival of the fittest,” as opposed to the phrase that accurately describes what happens in nature, “survival of those who fit __ for now ?

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In most populations of living things, each individual has ___ copies of each gene, which may be the same or different allelic variants. A population may have ________ allelic variants for a given gene.

a. 1, 2

b. 2, 4

c. 2, many

d. 1, many

e. 2, 2

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Explain why genetic drift may be important when captive populations of animals or plants are started with just a few individuals.

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Match the terms with their meanings:

a. gene pool	a variant form of a gene
c. allele frequency	the genetic makeup of an organism
d. genotype	exchange of genes between populations
e. gene flow	the relative representation of a given form of a gene in a population

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Which of the following statements is true of microevolution? (Select all that apply.)

a. It is a change in allele frequency within populations.

b. It is caused by inheritance of characters acquired during the life of an organism.

c. It is only seen when some allelic variants cause individuals to have increased reproductive success.

d. It always leads to adaptation.

e. It is caused only by natural selection.

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Agents of allele frequency change in populations include (select all that apply):

a. genetic drift.

b. meiosis.

c. mutation.

d. segregation.

e. natural selection.

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Agents that consistently produce adaptive evolution (adaptation) include (select all that apply):

a. genetic drift.

b. mutation.

c. meiosis.

d. natural selection.

e. gene flow.

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Mutations are (select all that apply):

a. generally beneficial.

b. sometimes heritable

c. always caused by changes in single base pairs of DNA.

d. the ultimate source of new genetic information.

e. prone to occur with great frequency.

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Match the agent of microevolution to its description:

a. mutation	chance alterations of allele frequencies, having the greatest effect on small populations
b. gene flow	a process through which traits that confer a reproductive advantage to individuals are seen with greater frequency in succeeding generations of a population
c. natural selection	movement of alleles between populations by migration
d. genetic drift	genetic drift brought about by migration of a subpopulation
e. founder effect	changes in the genetic material

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Finches in the Galapagos experienced __________selection on beak depth following a drought; the African finch P. ostrinus experienced __________ selection on beak size because it eats either very small, soft seeds or much larger, hard seeds.

a. stabilizing, directional

b. sexual, disruptive

c. directional, disruptive

d. disruptive, directional

e. stabilizing, disruptive

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