BISC 100 Chapter Notes - Chapter 14: Gene Flow

• School: Simon Fraser University
• Department: Biological Sciences
• Course: BISC 100
• Professor: Russell Day

Document Summary

Reproductive barriers between species: a reproductive barrier is anything that prevents individuals of closely related, we can classify reproductive barriers as either prezygotic or postzygotic species from interbreeding depending on whether they block interbreeding before or after the formation of zygotes, prezygotic barrier = prevents mating or fertilization between species, temporal isolation mating or fertilization occurs at different seasons or times of the day, habitat isolation populations live in different habitats and do not meet, behavioral isolation little or no sexual attraction exists between populations, mechanical isolation structural differences prevent fertilization, gametic isolation female and male gametes fail to unite in fertilization, postzygotic barriers = operate if interspecies matting actually occurs and results in hybrid zygotes, reduced hybrid viability hybrid zygotes fail to develop or fail to reach sexual maturity, reduced hybrid fertility hybrids fail to produce functional gametes, hybrid breakdown hybrids are feeble or sterile.