Essential Genetics 6th Edition by Daniel Hartl

Exercise 18

Recessive genes a , b , c , d , e , and f are closely linked in a chromosome, but their order is unknown. Three deletions in the region are examined. One deletion uncovers a , c , and d ; another uncovers a , b , and f ; and the third uncovers b and e. What is the order of the genes? ( Hint : There is enough information to order most, but not all, of the genes.)