BIO 12-SEX&selection08WEB

BIO 12-SEX&selection08WEB - Outline 12-sex &...

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1 10/17/2008 1 October 20 Lecture 12 10/17/2008 2 Outline – Introduction to Lab 3 – Definition of sex – Asexual vs sexual reproduction Today: • Evolution of gametes • Evolution of gender differences • Natural selection vs sexual selection 10/17/2008 3 Lab Cycle 1, Lab 3 this week Help: Tuesday & Thursday 11-1 in SE1085 Cycle 2, Lab 3 next week 10/17/2008 4 Lab 3: Bacteria & Evolution
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2 10/17/2008 5 Sex Genetic recombination by • Fertilization • Lateral gene transfer May be coupled with reproduction (producing offspring) 10/17/2008 6 Clicker: Compare the rate of reproduction If each female has 4 offspring, how many offspring after 4 generations for ASEXUAL & SEXUAL reproducing organisms? (assume in sexual that half the offspring are male) Asexual Sexual offspring A. 4 4 B. 16 8 C. 64 16 10/17/2008 7 Compare asexual & sexual reproduction ( Fig 12-13) 10/17/2008 8 The cost of sex “All things being equal” asexual populations should rapidly outnumber sexual populations. Give 3 reasons:
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3 10/17/2008 9 Advantages of sex 10/17/2008 10 1. Changing environment (Red Queen) hypothesis Offspring that are genetically different from their parents are more likely to survive and reproduce in an environment which changes from generation to generation. Consider lottery tickets: 100 of the same #
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This note was uploaded on 04/25/2010 for the course BIO BIO152 taught by Professor Cordon during the Fall '09 term at University of Toronto- Toronto.

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BIO 12-SEX&selection08WEB - Outline 12-sex &...

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