BIO 200 Lecture Notes - Lecture 9: Assortative Mating, Liger, Polyploid
24 Oct 2018
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Document Summary
Sympatric/sympatry- same or overlapping geographical areas, by definition they are ecologically isolated, use different parts of the habitat. Temporal isolation- species breed at different time of the day or seasons of the year. Behavioral isolation- species don"t recognize the mating signals of other species, blue-footed and red-footed boobies. Mechanical isolation- any physical difference that prevents sex/transmission of gametes, lock + key isolation. Gametic isolation- chemical cues from the egg fail to attract/block sperm, incorrect sperm can"t get into egg. Hybrid breakdown- infertile offspring in later generations, liger. How does allopatric speciation occur?- an event causes 1 species to split into 2, the species differentiate, and when barriers are removed the species can no longer produce offspring. Ways that allopatric speciation can occur (dispersal, vicariance, the third one )- Dispersal = similar to the founder effect. Vicariance = geographical barrier splits species into 2, like a river forming between beetles, movement of plates formed oceans.
