Draw the pedigree for this family. Three genes in Drosophila with the recessive alleles l, m, and n are known to be linked. You wish to determine the map distances between them and perform the cross shown below. Determine the order of these markers on the chromosome and the distances between them in centimorgans. This problem appeared on a previous 7.012 Exam.
Alkaptonuria is an extremely rare disease.
A pedigree of a family with the disease is shown below, with affected individuals indicated in black. In addition, the blood type of family members is given. Explain your answer. You can check your answers on the Solutions Page .