Question

You have discovered a special dye that reveals the position of recombination sites on meiotic chromosomes. You use this dye to count the number of recombination sites and then compare this to the number of genetic exchanges (spots that stain with the dye) that you can detect by looking at the segregation of markers across the genome. Therefore, you find many more recombination sites as compared to actual genetic exchanges. Explain this result.

Answer 1

Answer:

• Recombination by Holliday model or Double strand break model.
• both involves holiday junctions as intermediates.
• these junctions is resolved into either crossover or noncrossover.
• The more number of recombination sites than the number of genetic exchanges may be due to non crossovers.

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