GEV 4517 Lecture Notes - Lecture 4: The Selfish Gene, Naked Mole-Rat, Pie Chart
1 Dec 2016
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Lecture 4: speciation and behavioral ecology, chapters 3 and 4. Removes individuals form the center of the phenotype. Natural selection favors both ends of the phenotypic variation. 3. 5 mya isthmus of panama arose, separating pork fish into two populations with no opportunity for mixing. Since then, genetic changes led to formation of 2 species, caribbean and. Adaptive radiation: the diversification of a group of organisms into forms filling different ecological niches. Adaptive radiation is an example of allopatric speciation. Allopatric is the most common mechanism of speciation. Polyploidy: containing three or more sets of chromosomes. Some insects and 30 species of reptiles and amphibians are also polyploidy. Continental drift: the location of fossil plants and animals of present day continents can be explained by continental drift. Convergent evolution: within biogeographical realms, areas of similar climates are often inhabited by species with similar appearance and habits but from different taxonomic groups: example: these mammals that look similar but are not related.
