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?

Are the earth's ocean floor and continents the same age geologically? why or why not?

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?

How does science influence the decisions made about social, economic, and political issues?