092607_EvoDevo

092607_EvoDevo - 9/26/2007 Intro to Organismal Biology...

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9/26/2007 1 9/26/07 Intro to Organismal Biology Announcements 2 Exam I: next Monday Oct 1 st Study guide: Posted by tomorrow under “Course Documents” Office hour reminder: Thursday 9:30-11:20am Virtual Office hours: Post questions to Discussion Board. I will post responses on Sunday. Announcements 3 Lab assignments Turn-it-in: Don’t forget to upload Lab Report assignments (Intro and Methods for this week) to the Turn-it-in folder. Lab 3 : Results and Discussion due in two weeks (week of Oct 8) Today’s class Sympatric speciation, continued Macroevolution: How do major transformations arise through evolution? (Relevant reading: Ch. 24) 4 The process of speciation Two types of speciation: 5 1. Allopatric (“other country”) 2. Sympatric (“same country”) Sympatric speciation Speciation without geographic separation How is this possible? Polyploidy Habitat differentiation and sexual selection 6
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9/26/2007 2 Sympatric speciation: Habitat differentiation and sexual selection >500 species of cichlid fish in Lake Victoria Isolation barrier is assortative mating 7 Sympatric speciation: Habitat differentiation and sexual selection 8 Hypothesis for cichlid speciation:
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092607_EvoDevo - 9/26/2007 Intro to Organismal Biology...

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