BIOL 1F90 Lecture 14: lecture 14win

• School: Brock University
• Department: Biological Sciences
• Course: BIOL 1F90
• Professor: Amanda Lepp

Document Summary

Anagenesis:single species transformed into a different species over the course of many generations. Cladogenesis: division of a species into 2 or more species: clade is a group of biological taxa (e. g. , species) that includes all descendants of one common ancestor. Occurs when some members of a species become geographically separated. Two different populations may interbreed at hybrid zones. As the two populations accumulate different genetic changes, this may decrease the ability of individuals from different populations to mate with each other. Once gene flow through the hybrid zone is greatly diminished, the two populations are reproductively isolated. Occurs when members of a species that initially occupy the same habitat within the same range diverge into two or more different species: eg. , microhabitat partitioning. Tends to involve abrupt genetic changes that quickly lead to the reproductive isolation of a group of individuals: eg. , changes in chromosome number.