From the crossover data you gather for Sordaria, you will be able to calculate the map distance between the gene for ascospore color and the centromere.
To find the number of map units, you divide the percent of crossovers by two.
Why divide by two?

The division by 2 is required in other to obtain the exact map unit because a cross over event yields only one - half the spores in each ascus.

For any cross - over event, two spores are produced, at this rate, the number of spores produced after 4 cross over events would be (4 × 2) = 8 spores.

Hence, using these number of spores in each ascus, we can deduce the number of cross over events by dividing the number of spores by 2.

Therefore, division by 2 allows us to deduce the exact number of crossover events based on the number of spores.

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From the crossover data you gather for Sordaria, you will be able to calculate the map distance between the gene for ascospore color and the centromere. To find the number of map units, you divide the percent of crossovers by two. Why divide by two?

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From the crossover data you gather for Sordaria, you will be able to calculate the map distance between the gene for ascospore color and the centromere.
To find the number of map units, you divide the percent of crossovers by two.
Why divide by two?