BIO 181 Lecture Notes - Lecture 4: Eusthenopteron, Ulna, Humerus
14 Sep 2015
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Document Summary
There was also an animal (eusthenopteron) that can be a link to a whole group of current species: rabbits, birds, frogs, and lizards. Although disparate in quality and way of life, they share common bones (the humerus, ulna, and radius) with the extinct animal, which is a possible connector to legged vertebrates. Biogeography - the study of the geographical distribution of extinct and modern species; living species = extant: example: darwin"s finches. Artificial selection (selective breeding) - when humans decide which plants or animals will reproduce, thereby breeding certain characteristics and eventually causing the chosen ones to become the new norm: example: breeding of animals and plants. Example: the wing of a bat and wing of a butterfly. Developmental homology - the same structures in early development of different species may develop into homologous structures with very different functions: example: lanugo in babies, the tadpole stage, etc. Molecular homology similarities among organisms at the molecular level: example: dna, rna.
