LIFESCI 7B Lecture Notes - Lecture 12: Meiosis, Genetic Drift, Reproductive Isolation

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25 Apr 2020
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New species arise when two populations have diverged su ciently from one another. Chromosomal changes di erent numbers o chromosomes we have most of the same genes as chimpanzees but their arrangement of chromosomes are di erent we have a chromosomal fusion reproductively isolated chromosomal fusions: 23 chromosomes pairs vs 3 pairs incompatible. Alligators are closely related to hippos are closely related to moths are closely related to whales birds fungus. What do evolutionary trees show us? species are the most exclusive group domain is the most inclusive things that are more closely related will be grouped with taxonomic group. Characterisitcs of a phylogenetic tree types of groups anatomy of the phylogeny data types sister taxa -- 1 and. 1 and 2 are also monophyletic group because they include the common ancestor and all the descendants of the common ancestors. Let"s think about how the formation of the isthmus might have a ected speciation in this group gene ow.

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