BIOL 336 Lecture Notes - Lecture 18: Gene Flow
Document Summary
March 19, 2015 l18 notes if there is ongoing gene flow between two species when do you consider them different species? population that appear to be good species may not persist a partial barrier to reproduction might break down different species may merge back into one: mechanisms of reproductive isolation biological species concept (focusing on the evolution of reproducvtive barriers to gene flow) provides a mechanism that can be studied different processes can lead to different kinds of reproductive isolation, pre zygotic before embryo forms includes behavioural, geographical, ecological, post zygotic isolation hybrid sterility e. g. horses and donkeys can mate but offspring can be sterile with 63 (odd number) of chromosomes e. g. lions and tigers can mate in captivity wouldn"t mate in wild matters whether mother is tiger or father is tiger reproductive isolation is a continuous trait between species can range from 0 to 1 (no isolation to full isolation)
