BIOLOGY 1M03 Lecture Notes - Lecture 2: Hybrid Speciation, Sea Urchin, Reproductive Isolation

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Speciation is the splitting of one evolving group of organisms into two separately evolving groups. This splitting, followed by continuing evolution, is why we have a tree of life. Conceptually, we define species as evolutionary units: The biological species concept uses reproductive isolation to define species. Produce inviable offspring (not viable = don"t develop to adulthood) Produce sterile offspring offspring aren"t fertile = can"t reproduce) There"s a chance that 2 populations rarely come into contact due to geographic. Example: we bring a male from group a and a female from group b into the lab and distance discover that they will mate with each other. This is partial evidence that they come from the same biological species. We don"t know if they mate in the wild or whether they actually produce fertile, viable offspring. Mechanisms of isolation are divided into two classes: Prezygotic isolation: any mechanism that prevents successful mating. Different malaria parasites breed inside different hosts.

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