lab quiz 5 lab 13

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amandaadair10
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227983
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lab quiz 5 lab 13
Updated:
2013-07-26 16:34:32
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lab quiz Fernandez mtc bio 101 natural selection
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natural selection concepts and vocab
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  1. natural selection
    the mechanism that brings about adaptation to the environment as evolution occurs
  2. 3 factors that describe natural selection
    • 1. the members of a population have heritable variations (phenotypic traits) that can be passed from one generation to the next
    • 2. there is a competition for resources and members of the population with traits that allow them to better capture resources will reproduce to a greater extent than those that lack these traits
    • 3. across generations, a larger proportion will have these adaptive traits. in this way, the environment has selected how the genotype and phenotype makeup of the population will change over time
  3. agents of evolutionary change
    • 1. natural selection
    • 2. genetic drift
    • 3. mutation
    • 4. gene flow
    • 5. non-random mating
  4. hardy-Weinberg law
    • gives a way to know when evolution has occurred
    • states that normally, allele frequencies in the gene pool of a population stay the same from generation to generation
  5. 4 conditions of hardy-weinberg
    • random mating
    • no gene flow
    • no natural selection
    • infinitely large gene pool
  6. genetic drift
    • changes in allelic frequencies of a gene that are due solely to chance
    • ex. a natural disaster such as a flood or fire, or hunting by humans, may eliminate many individuals from a population so that the few remaining reproduced more than they normally would have.
  7. bottleneck effect
    occurs when a majority of genotypes are prevented from participating in the production of the next generation due to extreme natural or human interference
  8. founder effect
    a small population is more apt to undergo genetic drift- high allele frequency changes by chance

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