BIOL 336 Lecture Notes - Lecture 18: Heterogametic Sex, Ecological Speciation, Sympatry
Document Summary
Key terms: pre/postzygotic reproductive isolation, hybrid sterility/inviability, allopatry, sympatry, vicariance, polyploidy, secondary contact. Clicker 1: a, b, c are pre zygotic and d is post zygotic. Includes behavioural, geographical, ecological, mechanical, and gamete incompatibilities. Sexes of 2 populations are not attracted (they don"t speak the same language) (ex: re ies with di erent ash patterns between 2 similar looking species: postzygotic = prezygotic isoloation - behaviour ecological isolation occurs after embryo forms. Includes hybrid inviability, reduced hybrid fertility and ecologically-driven fitness effects on hybrids. Examples: hybrid sterility hybrid inviability = genes aren"t compatabile, reduced hyrid fertility = is sterile, ecological-driven = it is a mix of the parents so it has lower. Multiple isolating mechanisms typically contribute to total reproductive isolation reproductive isolation b/w species can range from 0 (no isolation) to 1 (full isolation) Can adaptation lead to speciation? remember that gene ow prevents population di erentiation. without di erentiation no speciation,
