lecture 34 - Cross-over recombination and chiasmata...

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Cross-over recombination and chiasmata
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Chiasmata in Diplotene phase of meiotic prophase I chiasmata Chiasmata are covalent linkages between two non-sister chromatids. This helps to keep bivalents together after synaptonemal complexes are gone Chiasmata are also sites of genetic recombination by crossovers Mom’s DNA Dad’s DNA Is this bad? What does this do? It contributes to genetic diversity
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20_07_recombination.jpg Crossing-over and recombination occurs between non-sister chromatids in pachytene Recombination Would a cross-over between sister chromatids change anything? Would it cause a mutation?
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BrdU Hybrid In Second generation Would this change the DNA sequence in mitosis?
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20_08_Chiasmata.jpg Segregation of chromatid DNA modified by recombination This is not recognized as a replication error and no checkpoint arrest is made
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The chromatids of each gamete are different in this case The DNA sequences of each chromatid may be different. Each gamete can get different genetic information.
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lecture 34 - Cross-over recombination and chiasmata...

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