01:119:115 Lecture Notes - Lecture 13: Allopatric Speciation, Ecological Niche, Ensatina

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:115
• Professor: Daniel Stern Cardinale

Document Summary

Species is a lain word meaning kind or: appearance . Speciaion process where one species splits into two new species. Microevoluion changes over ime in the alleles in a populaion. Macroevoluion a board patern where species are formed. Reproducive isolaion: reproducive isolaion is the existence of biological factors (barriers) that impede two species from producing viable ferile ofspring. Hybrids are the ofspring of cross between diferent species. Reproducive isolaion can be classiied by whether factors act before or ater ferilizaion: prezygoic barriers block ferilizaion form occurring by: Ex: sea urchins: postzygoic barriers prevent the hybrid zygote from developing into a viable, ferile adult, reduced hybrid viability: genes of the diferent parent species may interact and impair the hybrid"s development. Ex: ensaina hybrid: reduced hybrid ferility: even if hybrids are living, they may be sterile. Ex: donkey + horse = mule (sterile hybrid- all female. )