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Gene Linkage, Crossing Over, & Mapping

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Uploaded by on Nov 7, 2011

Genes may crossover before segregating. The frequency of crossover gives rise to mapping genes on chromosomes. THe larger the mapping distance, the more likely they are to crossover.

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  • it doesnt make sense why did u cross two genes on the second cross over?

  • @JejeBabe Think about being at the ends of the chromosomes. On that second cross, you are a bit closer to the centromere. So, if you cross at that location, not only do the two genes I placed on the DNA cross, but all others that I didn't place as well. You see?

  • @JejeBabe When it is a single cross, everything goes with it. You need at least two crosses to have isolated genes cross over.

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  • Why is it 3 percent chance on the double crossover? What is the math?

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