Question

Luto number of accounted x 100 = crossovers So 1 x 100 = 555 crossovers Part K. Using the frequency of crossing over to map genes From the crossover data you gather for Sordaria, you will be able to calculate the map distance between the gene for ascosporo color and the contromero Centromere Allele for ascospore color Distance of the allele for ascospore color from the centromere To find the number of map units, you divide the percent of crossovers by two Why divide by two? Each crossover produces two ascospores like the parents and two spores mat we area of the crossover. Thus, to determine the number of crossovers you must divide the percentage of crossovers by two since only half the spores in each ascus result from crossing over Using the data from the question above, calculate the map distance between the gene for ascospore color and the centromere 55 map units Submit Previous Answers Rest Answer

Answer 1

The map distance is calculated by dividing the number of recombinants from the total number of individual offsprings produced from the cross.

Number of recombinants from the cross = 2

Number of offsprings from the cross = 2+2 = 4

Hence map distance = 2/4

Map distance = 0.5 Morgans = 50 map units.

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