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CH6-3 - Chapter 6 part III Genetic diversity and evolution...

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Unformatted text preview: Chapter 6 part III Genetic diversity and evolution Genetic Mutations occur, but infrequently Diversity through: Independent assortment of chromosomes Makes gametes with new allelic combinations on different Makes chromosomes chromosomes Crossing over Makes new combinations on the same chromosome Pair of homologous chromosomes Pair (the same, but different) It seems like during recombination, the chromosomes It break and reform. Is this true at the DNA level? break Does DNA break and rejoin during recombination? Meselson and Weigle – Used viral DNA and Meselson heavy isotopes heavy Coinfected E. coli with light and heavy strains of Coinfected virus virus 13 One batch of growth media contained 13C and 15N One and 15 12 2nd batch contained 12C and 14N and 14 Separated on a CsCl density gradient What would the test tube look like if: 1.There is no physical breakage and rejoining of DNA? 2.There is breakage and rejoining? (We’’re skipping the “double-strand break (We re repair” model for recombination) repair” Clicker: Is it possible to be an XY female or an XX male? female 1. Yes 2. No XY female and XX male XY ...
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