BIO 200 Lecture Notes - Lecture 9: Lactuca Canadensis, Species Problem, Reproductive Isolation
27 Jun 2015
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Lecture 9: species concepts, reproductive isolation, and species formation. Prezygotic isolating mechanisms: happens before zygote is formed, prevents sex or fertilization, geographic or ecological isolation: individuals must meet to be able to breed, allopatric: organisms that live in separate geographical areas. Reproductively isolated: sympatric: organisms that live in the same geographical area. Live in the same area but different locations. May breed and produce offspring in captivity. Liger: offspring of female lion and male tiger. Tigon: offspring of male lion and female tiger. Infertile: temporal isolation: difference in breeding seasons or times, may live in the same geographic location, can breed in lab, example: wild lettuces. Lactuca canadensis flowers bloom in the summer: behavioral isolation: opposite gender of a different species is not attractive, potential mates of another species does not look or behave sexy , example: blue- and red-footed boobies. Males have different types of mating dances.
