Estion 13 of 17 >
Use the data provided in the figure to calculate the
recombination frequency between the two genes.
Parents
Wild Type
o
Black with
vestigial wings
(gray with
normal wings)
bbvg' vg
bb vg vg
recombination frequency:
%
Wild Type
Black normal
Black vestigial
Gray vestigial
bbvg' vs
bbvg' vg bbvg vg bib vg yg
The number of each type of offspring is
• wild type: 865
• black vestigial: 875
gray vestigial: 160

Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)