BIO 200 Lecture Notes - Lecture 9: Assortative Mating, Polyploid, Macroevolution

• School: University at Buffalo
• Department: Biological Sciences
• Course: BIO 200
• Professor: Francis Poulin

Document Summary

And speciation is when all those little micro evolutionary changes add up to a big evolutionary moment and we call that macroevolution. Different species look different, behave different, and have different resources. Even closely related species, we can tell apart. Morphological species concept: individuals of a single species share measurable traits. Sometimes it"s hard to tell between species just by physical appearance. (ex. The biological species concept (ernest mayr)- defines species as groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups. A species is comprised of populations whose members mate and reproduce offspring. Or would if they able to come into contact with one another. Different species do not mate or cannot produce fertile offspring. Who is have sex with whom is what defines a species. Plants hybridize with each other all the time, which makes this biological species concept kind of iffy. Prezygotic occurs before fertilization and postzygotic occurs after fertilization.