BIO120H1 Lecture Notes - Lecture 9: Hummingbird, Zygosity, Allopatric Speciation
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BIO120H1 Full Course Notes
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People jerry coyne, ernst mayr, douglas schemske, dolph schluter. Topics & concepts species concepts, modes of speciation, reproductive isolating mechanisms, ecological speciation, speciation genes, adaptive radiation, hybridization, polyploidy, Hawaiian honeycreepers have all descended from a single species of finch in the last. Jerry coyne (1992) - (cid:862)when (cid:449)e understand the origin of reprodu(cid:272)ti(cid:448)e isolating fa(cid:272)tors, we understand the origin of the spe(cid:272)ies(cid:863) Taxonomic: phenetic, genetic, ecological and phylogenetic, based primarily on morphological differences. Biological: recognition, cohesion, darwinian and evolutionary, based on inter-fertility among individuals. Biological species concept (bsc) - ernst mayr (1942) The biological species concept is a group of interbreeding natural populations that are reproductively isolated from other such groups. Must be possibility of interbreeding in the wild. Does not work well for bacteria, asexual, and highly self-fertilizing species. Sterility and fertility are not categorical, rather on a continuum. Known as the theory of geographic speciation since geographical isolation is involved.
