anthrplgy xm

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anthrplgy xm
2012-03-17 21:01:12
nthrplgy xm

nthrplgy xm
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  1. Natural Selection
    The most critical mechanism of evolutionary change, first decribed by Charles Darwin , refers to genetic change or changes in frequencies of certain traits in populations due to differential reproductive success between individuals.
  2. 5 facts 3 inferences of NAT SELECT
    • f1Potential exponential population increase.
    • f2but populations in steady state.
    • f3 resource limited, esp, food,space, and mate
    • f4 uniqueness of individuals within population.
    • f5 most parental vriatn inhrtd by ofsprng

    • inf 1 strgl 4 xstnce among indvdl ppltn.
    • inf 2 dffrntl srvivl nd rprdctn =ntrl slctn
    • inf 3 cntnud ovr mny genrtns = dscnt wth modfctn.(evltn)
  3. Genetic Variation: variatn n alleles f gns, occrs bth wthin nd amng ppltns

    NAtural Selection:
    wtht gntc vrtn, sme of the bsc mchnsms of evltnry chng cnnt oprat

    3 srcs of gntc vriatn 1Mutations - changes in DNA, single mutation cn hv lrg efct. evltnry cnge bsd on acmltn mny mutatns. 2 gene flow- mvnt of gns frm 1 ppltn 2 anthr,mprtnt src of gntc vrtn 3 Sex - ntrdc nw gne cmbntns nto ppltn. gntc shuflng nthr mprtnt src of gntc vrtn
  4. 5 traits used to dfne the order prmates
    • The prosimians grd 1,2 3 tarsiers with prosimian and anthrpd chrctrstcs, 4 are monkeys, grd 5 are pes.
    • Strepsirrhini- wet nosee less intelligence,stronger smell,snouts elongated like dog. nocturnal, orbital bar, large ears
    • Haplorhini - dry simple nose less smell, longer arms than legs, larger brain, lilfe span, 1 pffsprng lots of mtrnl care,