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Chapter 17
Genes and Variation.
9
Biology
9th Grade
05/25/2014

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Term
What is fitness?
Definition
How well an animal can survive and reproduce in its environment.
Term
What is a population's gene pool?
Definition
all the genes, including all the different alleles for each gene, that are present in a population at any one time.
Term
What does natural selection act upon?
Definition
phenotype.
Term
What is genetic drift?
Definition
random change in allele frequency caused by a series of chance accurrences that cause an allele to become more or less common in a population.
Term
What conditions are necessary to maintain genetic equilibrium?
Definition
situation in which allele frequencies in a population remain the same.
Term
Behavioral isolation?
Definition
difference in courtship rituals or other behaviors.
Term
Geographic Isolation?
Definition
two populations are separated by geographic barriers.
Term
Temporal Isolation?
Definition
two or more species reproduce at different times.
Term
Reproductive Isolation?
Definition
two populations can no longer inbreed. Results in the formation of a new species.
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