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10thBIO-Chp 15.2 voc

Jorge The theory of eveloution Chapter 15.2

QuestionAnswer
Adaptive radiation When an ancestral species evolves into an array of species to fit a number of diverse habitats.
Allelic Frequency The percentage of any specific allele in the gene pool.
Convergent Evolution A pattern of evolution in which distantly related organisms evolve similar traits.
Directional Selection Occurs when natural selection favors one of the extreme variations of a trait.
Disruptive Selection Individuals with either extreme of a traits variation are selected for.
Divergent Evolution The pattern of evolution in which species that once were similar to an ancestral species diverge.
Gene pool Picture all of the alleles of the populations genes as been together in a large pool.
Genetic drift Alteration of allelic frequencies by chance events.
Genetic equilibrium They refer to a population in which the frequency of alleles remains the same over generations.
Geographic isolation Occurs whenever a physical barrier divides a population.
Gradualism The idea that species originate through a gradual change of adapations.
Polyploid Any individuals or species with a multiple of the normal set of chromosomes
Punctuated equilibrium This hypothesis argues that speciation occurs relatively quickly
Reproductive isolation When formerly interbreeding organisms can no longer mate and produce fertile offsprings.
Speciation When members of similar populations no longer interbreed to produce fertile offspring within their natural environment.
Stabilizing selection Is natural selection that favors average individuals in a population.
Created by: asimien907