We were learning about chromosome mapping with this lab. We had to throw a stick across a line and marker how many times a gene had a crossover; we did that a hundred times. Then we had to calculate the frequency of each by taking the number of times that gene had a cross over, then divided by 100. Then taking that frequency, we multiplied by 15 to calculate the gene location of each gene. Then we answered a few questions. This lab was fun to do, and did help with understanding how linkage worked and how certain genes would become recessive and to map a chromosome by finding the frequency to find the length between each gene.