BIOL 1001 Lecture Notes - Lecture 18: Reproductive Isolation, Phylogenetics, Anagenesis
13 Jul 2017
School
Department
Course
Professor
Document Summary
Process of creating new species from ancestor species. Under most models it takes a long time for species to be created: phyletic speciation, phylogenetic speciation. Species: species are truly distinct real entities, species is an idea we have imposed on nature, or something in between depending on situation. An evolutionary independent population or groups of populations. Species is not fixed, they are constantly changing and have variability. Populations whose members have potential to interbreed in nature and produce viable and fertile offspring. Individuals from two population cannot or don t interbreed. Then maintains the separated gene pools and turns them into separate species types: In isolated populations, if gene flow ends, allele frequencies diverge. Types: habitat isolation, geographic isolation, temporal isolation, behavioural isolation, mechanical isolation, gametic isolation. Acts that serve as indicators for wanting to mate are different. Gametes of different species cant fuse to form a zygote. The way the reproductive organs work is different.
