This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: CHAPTER 24 THE ORIGIN OF SPECIES Species: Latin for kind or appearance Biological Species Concept Defines a species as a population or group of population of populations whose members have the potential to interbreed in nature to produce viable, fertile offspring Cannot be applied to o Asexual organisms o Fossils o Organisms about which is little is known regarding their reproduction Speciation Dependent on o Reproductive isolation o Genetic divergence o Isolated population diverges if they come back together, they can no longer reproduce Reproductive Isolation The existence of biological factors that impede members of two species from producing viable, fertile offspring o Prezygotic barriers- prevent zygote forming keep gametes from coming together -- Ex (does not mate) :- (Habitat Isolation) species living in the same place but different habitats- (Temperoal) different breeding time of the year - (Behavioral Isolation) different behaviors behaviors are unique to a different species. enable mate - (Behavioral Isolation) different behaviors behaviors are unique to a different species....
View Full Document
- Spring '08