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evolution
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natural selection
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Bolvin-L1BioCh15

Vocab review

QuestionAnswer
evolution gradual change in the characteristics of a species over time
natural selection mechanism for evolution in which the best adapted to the environment survive to reproduce and pass on their well adapted genes
adaptation any trait that helps an organism survive
structural adaptation similar structures in completely unrelated species: ex. wings on a bird and a bee
homologous structure similar body parts on somewhat related organisms like the forelimb bones on humans, bats, and whales
vestigal structure body part with no apparent function in modern species that had a function in ancestoral species
artificial selection man breeding animals and plants to get offspring with the desired traits
allelic frequency how often a form of trait occurs in a population
genetic drift a higher than normal allelic frequency in a population due to a chance mutation in a small population
stabilizing type of natural selection that favors the average individuals
directional type of natural selection that favors one extreme variation in a population
disruptive type of natural selection that favors both extreme variations in a population
polyploid individual that has multiple sets of chromosomes, common in plants
gradualism rate of evolution in which speciation occurs very slowly and steadily over a long period of time
punctuated equilibrium rate of evolution in which long periods of genetic stability are interrupted by a blast of rapid speciation and extinction
adaptative radiation one species evolves into two species which each evolve into 2 species until there are many different species all with the original species as an ancestor
Created by: abolvin
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