BIOL 1001 Lecture Notes - Lecture 21: Continental Drift, Assortative Mating, Wild Type

• School: York University
• Department: Biology
• Course: BIOL 1001
• Professor: Alexander Mills

Document Summary

This means when speciation occurs when there is an other father land; two fatherlands. If there is a physical (usually geographic) separation, we call that. Allopatric cladogenesis: cladogenesis is when we go from one gene pool to two; two different homelands (cid:858)allo(cid:859) (cid:373)ea(cid:374)s othe(cid:396) (cid:858)pat(cid:396)ia(cid:859) (cid:373)ea(cid:374)s fathe(cid:396), (cid:396)efe(cid:396)(cid:396)i(cid:374)g to fathe(cid:396)la(cid:374)d. So, allopatric speciation is a process that occurs between gene pools that are separated physically. But speciation is possible without physical separation. Increasingly, there is theoretical and empirical evidence for. Sympatric cladogenesis (cid:858)sy(cid:373)(cid:859) (cid:373)ea(cid:374)s togethe(cid:396) (cid:858)pat(cid:396)ia(cid:859) (cid:396)efe(cid:396)s to fathe(cid:396)la(cid:374)d. Two gene pools together in one father land; dividing two gene pools without physically separating it. So, sympatric speciation is a process that occurs between gene pools that are not separated physically. Two ways to achieve geographic isolation: dispersal (such as founder effect, vicariance. Dispersal occurs when a population moves to a new habitat, colonizes it, and forms a new population: e. g. founder.