Problem
Dr. D next hands you a different tray of vials of flies. He has better records for these flies. He had mated a fly with no bristles to a fly with no antennae. The F1 offspring of this cross all appeared wild type - they had both bristles and antennae. He mated one of male F1s with a female fly that did not have bristles or antennae. The vials of flies he has given you contain their F2 offspring. You count those, and observe the following phenotypes:
117 With both bristles and antennae
832 With bristles but not antennae
795 With antennae but not bristles
123 With neither bristles nor antennae
Based on the ratios of these offspring phenotypes,
i. Are the genes linked or not? If they are, what is the recombination frequency? What is the map distance between these genes?
ii. What is the arrangement of the alleles on the male parent's chromosomes?