BIOLOGY 280 Lecture : Unit 1
Document Summary
9/10/18: direct observation, darwin"s finches, finches" beak size changed over time on the. Individuals in a population vary i. e humans vary: traits are passed from parents to offspring, postulate 1 + postulate 2 = heritable variation. Individuals with fewer bristles were able to reproduce more: experimental test (losos et al, does anole morphology evolve in response to a changed. The resistant bacteria multiply and become more common. Insertions and deletions (often frameshift: new genes (by gene duplication) arise from, retrotransposition, unequal crossing over, nondisjunction (aneuploidy, polyploidy, horizontal gene transfer (common in microorganisms, new combinations of alleles arise from. 10/1/18: genetic drift summary, sampling error = random changes allele frequency, more powerful in small populations, reduces genetic diversity within populations, main mechanism of evolution at molecular level. Increases differences between populations: non-random mating, does not by itself cause evolution, but can indirectly influence evolution, non-random mating (inbreeding), followed by natural selection reduces allelic diversity.
