LIFESCI 7B Chapter Notes - Chapter 5: Species Problem, Species Complex, Ring Species
4 Sep 2018
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Document Summary
Dif culty of de ning species--species are uid and capable of changingwhich is the whole point of evolution. Species are reproductively isolated from other species: when comparing genomes, they also cluster based on similarity. Distances between dots within a cluster re ect variation. Human cluster may be messy but its separate from chimpanzee cluster. Re ection of ability to exchange genetic material by producing fertile offspring. Closed gene pool--alleles can be shared among members of that species. So species become extinct and it"s species that give rise to new species. Biological species concept (bsc): species are groups of actually or potentially interbreeding populations that are reproductively isolated from other such groups. "actually or potentially" ex: elephants in sri lanka and india are geographically separated so they"ll never mate. Bsc is more useful in theory than practice. Members of the same species usually look alike. Today, we see the same species usually have similar dna sequences.
