BI111 Lecture Notes - Lecture 9: Heritability, Medium Ground Finch, Allele Frequency
Document Summary
Evolution theory before darwin: lamarck"s contributions to evolutionary thought. Change pass on from one generation to the next. Hypothesized mechanism (principle of use and discus and principle of inheritance of acquired characteristics) Darwin partook on the hms beagle which took about 5 years and exposed him to a huge biodiversity. Adaptive evolution: a population"s characteristics change over time, as advantageous traits become more common. Although evolution experiences selection, there are changes of alleles which cause the individuals with higher fitness and reproductive success to remain for longer periods of time. Finches flown out to sea from ecuador, isolated from the main land. Population has ability change based on environment parameters and become better specialized to use different resources. Endemic- species found there and nowhere else. Large-ground finches- died off second year during the drought because there were no new seed beds (10+ to 3 grams)
