BIO120H1 Lecture Notes - Lecture 12: Phenology, Directional Selection, Genetic Diversity
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BIO120H1 Full Course Notes
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Strong selection for earlier flowering, habitat dries out: early flowering is adaptation, hybrids are intermediate bwtween two parental values, field mustard has an annual life cycle. Biodiversity = the # and kinds of living organisms in a given area: two elements. Interspecific variaon or species diversity studied by ecologist. Intrasepcific vatiation or genetic diversity studied by geneticists: comes from fisher, loss of biodiveristy s irreversible and lease predictable, earth"s biota is largely unstudied and unappreciated eo. Biodiversity hotspots: twenty-five biodiversity hotspots identified and receiving special conservation efforts, most are in tropics, conservation sites = not just biologists, architects, lawyers must study it. Extinction is the permanent elimination of a species extinction is forever! types. Background extinction turnover of species at a low rate a natural feature of ecosystems; estimated at ~1 species per year. It (cid:272)ould (cid:271)e (cid:373)ore or less tha(cid:374) 1, (cid:449)e do(cid:374)"t k(cid:374)o(cid:449), still lo(cid:449) Mass extinction very large numbers of extinctions due to natural catastrophes.
