BIOL 1202 Lecture Notes - Lecture 3: Cichlid, Chromosome, Gene Flow
Document Summary
24. 1 the biological species concept emphasizes reproductive isolation (cid:1) (cid:1) (cid:1) Defines a species as a population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring. Cannot be applied to: asexual organisms, fossils, organisms about which little is known regarding their reproduction. (cid:1) (cid:1) The existence of biological factors that impede members of two species from producing viable, fertile offspring. Impede mating between species or hinder the fertilization of ova if members of different species attempt to mate. Often prevents the hybrid zygote from developing into a viable, fertile adult: genetic divergence (cid:1) (cid:1) 24. 2 speciation can take place with or without geographic separation (cid:1) Sympatric speciation (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) Gene flow is interrupted or reduced when a population is divided. Other country into two or more geographically isolated subpopulations. Speciation that takes place in geographically overlapping. Gene flow is bad: sympatric speciation has resulted from nonrandom mating.
