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ch.24 - Chapter 24 Friday 1:50 PM Formulas Theorems Covered...

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Chapter 24 Friday, January 23, 2009 1:50 PM Formulas & Theorems Covered Today: The Origins of Species Lecture Topic: 1. Concept 24.1: the biological species concept emphasizes reproductive isolation 2. Species a. Latin for "kind" or "appearance" 3. The Biological Species Concept a. Defines a species a s a population or group of populations whose members have the potential to inter breed in nature and produce viable, fertile offspring b.Cannot be applied to i. Asexual organisms ii.Fossils iii. Organisms about which little is known regarding their reproduction 4. Speciation a. Dependent on two things (fig. 24.14) i. Reproductive isolation ii.Genetic divergence 5. Establishing Reproductive Isolation a. Figure 24.7 6. Reproductive Isolation a. The existence of biological factors that impede members of two species from producing viable, fertile offspring b. Prezygotic barriers i. Prevent zygote from fertilization c. Postzygotic barriers i. Offspring isn't fertile 7. Prezygotic Barriers a. Impede mating between species or hinder the fertilization of ova if members of different
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