BIOSC 0160 Lecture Notes - Lecture 21: Classical Conditioning, Zygote, Speciation
25 Oct 2017
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Lecture 21: allopatric populations may become separate species, but they do nto have to be separate species. Sympatric speciation: not separated physically, they are in the same space, there is no gene flow between individuals in the same location, and they diverge into separate. In the same space but cannot breed together species: this happens because, different habitats: organisms may occupy different niches in their world. Originally only laid eggs on hawthorns, until apple trees came along. Now they can also lay eggs on apple trees. Females generally choose to lay eggs on the type of fruit they grew up in. Apple flies generally end up mating with other apple flies. Hawthorn flies generally end up mating with hawthorn flies these are both due to scent preferences. If they have diverged genetically: prezygotic isolation happens, little to no gene flow, mating is rare, populations continue diverging.
