01:119:115 Lecture Notes - Lecture 28: Species Problem, Sympatric Speciation, Ecological Niche

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:115
• Professor: G Transue

Document Summary

Iii. process of speciation (cc, seq allopatric, sympatric speciation) Iv. rate of speciation (cc gradualism, punctuated equilibrium) (process by which 1 species splits into 2; the appearance of a new species: due tomacroevolution (1) (mutation/genetic drift, gene flow, nat. selection + Reproductive isolation interbreeding & producing viable, fertile offspring: prezygotic isolating mechanisms . Before mating: habitat isolation, overlapping geographic range, but live/breed in different areas, rarely interact, no opp"s to mate, overlap, but breed @ diff. times (year, season, day, temporal isolation, example: one day, behavioral isolation. Dendrobium orchids (flower on diff days, only open for: species-unique behaviors enable mate recognition (1) courtship. After mating: mechanical isolation, gametic isolation, mating attempted but sexual structures incompatible, molecular/chemical diff"s between species - egg & sperm, common in aquatic organisms c, postzygotic. Reproductively isolation of populations of same species: allopatric . Speciation: geographic isolation , mechanisms: