Biology 1001A Lecture Notes - Lecture 22: Selective Sweep, Lactase Persistence, International Hapmap Project
7 Mar 2016
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Females will do better if they can mate assortatively in their own pop. If pops come back into secondary contact, and if postzygotic isolation has already occurred . Then individuals who avoid hybridizing have a selective advantage. When secondary evolution happens happens fast. Secondary contact can accelerate speciation, or induce species collapse jut depends on the timing. Will become both postzygotic and prezygotic speciation. Any prezygotic mechanisms are less costly than producing postzygotic mechanism. Two pops resume gene flow = species collapse, speciation begun and two lineages __________ Homo sapiens that are the oly representative of homo genus. Over last 100 000 years, our lineage that gave rise to recent homo sapiens, we overlapped with other groups of homos. Hominids - anything that is more closely related to humans than chimps. Branched off more recently when chimps and humans branched off. Neanderthals 40 000 years ago they became extinct. Lots of fossil record and genetic record on them.
