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evolution terms

Discussion in 'MCAT Discussions' started by johnnyMD, Mar 30, 2004.

  1. johnnyMD

    johnnyMD Membership Revoked
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    are these terms correct? what other terms do i need to know for mkcat

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    Mutation - random changes for new alleles.
    Fitness - denotes survival of species and only requires reproduction.
    Genetic drift - random evolutionary changes in allele frequency, not by evolutionary forces. small population.
    NS - "intentionally" selects "good" alleles over bad ones, changes allele frequency.
    Hardy Weinberg- fixed allele frequency in an ideal population.

    Reproductive isolation - capable of successful offspring, but doesnt. No mixing genes btw. species.
    Adaptive radiation - via mutation, subpopulation of species is able to reduce competition by occupying new niche. ultimately forms new species.
     
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  3. princessd3

    princessd3 Senior Member
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    Fitness is not really the survival of the organism. It's a measure of reproductive succes, or how well an organism's are passed on to the next generation. An organism can be perfectly healthy but yet fitness is low. A mule has zero fitness because it is sterile, no ablitly to pass on its genes.
     
  4. johnnyMD

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    is fitness characterized by one (1) individual's passing of alleles to future generations, or does fitness apply to only a mass population?
     
  5. Kazema

    Kazema In a kingdom by the sea
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    I think fitness refers to all individuals that carry the allele. All mules are sterile, so their fitness is zero. For a hypothetical allele that causes sterility in homozygous recessives, the fitness of homozygous recessives is zero, while the fitness of heterzygotes is unaffected.

    Probably.

    EDIT: Actually I guess the fitness refers to the allele itself, so the frequency of the allele would actually decrease over time and therefore the allele has low fitness? I think I probably confused people even more by posting :p.
     
  6. princessd3

    princessd3 Senior Member
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    I think when you mention fitness you're referring to an organism and not the entire species.
     
  7. johnnyMD

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    Fitness of a geno/pheno is its reproductive contribution to future generations relative to other geno/pheno. "fitness measures the relative success among genotypes that leads to changes in allele frequency, that is, evolution."
     
  8. princessd3

    princessd3 Senior Member
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    Right so seems to me that's refering to it on an individual level. Like you just said it's a comparison of reproductive sucess among individuals.
     

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