Slide 31 Quiz Study Guide

Habitat isolation (prezygotic barrier)

populations live in different habitats and do not meet

behavioral isolation (prezygotic barrier)

little or no sexual attraction between males and females

temporal isolation (prezygotic barrier)

mating or flowering occurs at different seasons or times of day

Mechanical isolation (prezygotic barrier)

structural differences in genitalia or flowers prevent copulation or pollen transfer

gametic isolation (prezygotic barrier)

female and male gametes fail to attract each other or are inviable

reduced hybrid viability (postzygotic barrier)

hybrid zygotes fail to develop or fail to reach sexual maturity

reduced hybrid fertility (postzygotic barrier)

hybrids fail to produce functional gametes

hybrid breakdown (postzygotic barrier)

offspring of hybrids have reduced viability or fertility