7.1 Intro to evolution and natural selection - part 4
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11 Terms
what are the sources of variation in a population?
genetic variation, environmental variation
what is genetic veriation?
difference in the genetic makeup of individuals within a population
what are the mechanisms of genetic variation?
mutations, gene flow, genetic drift
what are mutations in genetic variation?
random changes in dna > new traits/characteristics
what is gene flow in genetic variation?
individuals move between populations and introduce new genetic material
what is genetic drift in genetic variation?
random flunctuations in population allele frequencies due to chance
what are some examples of genetic drift?
bottleneck effect, founder effect
what is environmental variation?
differences in physical/biological factors individuals experince in their environment
what are the factors of environmental variation? (5)
temperature, moisture, nutrient avalibilty, predation, competition
How does environmental variation lead to new traits?
influences expression of traits/the success of individuals = variation in new traits
how does this variation impact natural selection?
provides raw material for natural selection to act upon > adaptations
