Biology Evolution Vocabulary Flashcards


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created 11 years ago by QuintonFrederick
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1

Evolution

change in a species overtime; process of biological change by which descendents come to differ from their ancestors.

2

Theory

Prposed to be explanation for a wide variety of observations and experiemental results.

3

Fossil

trace of an organism from the past.

4

Artificial selection

Process by which humans modify a species by breeding it for certain traits.

5

Fitness

measure of an organism's ability to survive and produce offspring relative to other members of a population.

6

Adaptation

inherited trait that is selected for overtime because it allows organisms to better survive in their environment.

7

natural selection

by which individuals that have inherited beneficial adaptations produce more offspring on average than do others individuals.

8

Homologous structure

body part that is similar instructure on different organisms but performs different functions.

9

vestigal organ

remnants of an organ or structure that functioned in a earlier ancestor.

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RelaTIVE FREQUENCY

estimate of the age of a fossil based on the location of fossils in strata.

11

Gene Pool

collection of alleles found in all of the individuals of a population.

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Polygenic trait

trait that is produced by two or more genes.

13

Directional selection

pathway of natural selection in which one uncommon phenotypes selected over a more common phenotype.

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stabilizing selection

pathway of natural are selected over phenotypes at both extremes.

15

disruptive selection

pathway of natural selection in which two opposite, but equally uncommon, phenotypes are selected oven the most common phenotype.

16

genetic drift

change in allele frequencies due to chance alone,occuring most commonly in small populations.

17

hardy-weinburg equilibrium

condition in which a population allele frequencies for a given trait do not change from generation to generation.

18

speciation

evolution of two or more species from one ancestral species.

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reproductive isolation

final stage in speciation which members of isolated populations are either no longer able to mate or nothing able to produce viable offsprings.

20

Behavioral Isolation

isolation between population due to