BIOL 302 Lecture Notes - Lecture 14: Adaptation, Indep, Melanin
24 Oct 2017
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Differential warming of the earth by the sun creates areas of warmth and cold; seasonal variation (bc of the tiled axis); differential warming contributes to wind and ocean currents: 3 reasons for why biological impact is. We need to understand the biology of the organisms really well; most species are virtually u(cid:374)k(cid:374)o(cid:449)(cid:374) . What is evolution: change in gene freq of a population over time, descent with modification. Adaptation: e(cid:448)olutio(cid:374)ary pro(cid:272)ess (cid:271)y (cid:449)hi(cid:272)h the traits of orga(cid:374)is(cid:373)s , white breasted nuthatch vs crestella : cases of convergent evolution, crestella has evolved indep. Of nuthatch but does that exact same thing as the. What is required by evolution of natural selection: phenotypic variation must exits, variation must be heritable, fitness must correspond to differences in fitness. Classic example of ns: beach mouse [hopi hoeksta: mc1r alleles and melanin, a single amino acid mutation contributes to adaptive beach mouse colour pattern, 9. 8-36. 4% variation.
