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16 Cards in this Set

  • Front
  • Back

gene pool

Combined genetic info of all members of a particular population

relative frequency

Number of times allele occurs in a gene pool compared with the # of times other alleles occur

single gene trait

Traits controled by a single gene that has 2 alleles

polygenic trait

traits controlled by 2 or more alleles

directional selection

Form of natural selection in which the entire curve moves

stabilizing selection

Form of natural selection by which the center of a curve remains in its current position

disruptive selection

Form of natural selection in which the entire curve splits in two

genetic drift

Random change in allele frequencies that occurs in small populations

founder effect

Change in allele frequencies as a result of the migration of a small group of a population

hardy-weinburg principle

Principle that allele frequencies in a population will remain constant unless 1 or more factors cause the frequencies to change

genetic equilibrium

Situation in which allele frequencies remain constant

reproductive isolation

Separation of species of populations so that they cannot interbreed and produce fertile offspring

behavioral isolation

Separation of species of populations so that they cannot interbreed and produce fertile offspring

geographical isolation

Form of reproductive isolation in which 2 populations are separated physically by geographic barriers such as rivers, mountains, and water

temporal isolation

Form of reproductive isolation in which 2 populations reproduce at different times

speciation

Formation of a new species