BIO 150 Lecture Notes - Lecture 20: Natural Selection, Mutation, Genetic Drift
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Short term changes: evolution- how organisms have changed overtime- long-term changes, evolution is concerned with the diversity of organism. Evolution- what adaptations allow organisms to do what they do: e(cid:448)olutio(cid:374) is (cid:862)des(cid:272)e(cid:374)t (cid:449)ith (cid:373)odifi(cid:272)atio(cid:374)(cid:863)- it is a scientific theory, evolution is both a pattern and a process- 1. organisms are related by descent from common ancestors. - you look like your parents: organisms have changed overtime, charles darwin helped us see the root process of evolution. 50% of a(cid:373)eri(cid:272)a(cid:374)s do(cid:374)"t k(cid:374)o(cid:449) the defi(cid:374)itio(cid:374) of e(cid:448)olutio(cid:374) 1. organisms are related by descent from common ancestors:get from slide. Homologous traits are similar because: they result from convergent evolution, they are derived from a common ancestor, they are derived from different ancestor, their appearance, structure or development is similar. Passing a trait to offspring: makes organism survive better or produce more. Examples of natural selection process: galapagos finches- live on the island. When the galapagos had a drought, they saw change in the birds.
