Which step is a physician most likely to take first with a patient who has a
family history of obesity?
A. Give diet recommendations
B. Preform blood tests
C. Preform genetic screening
D. Preform surgery

Explanation:

B. because you want to start simple then go from there  

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

correct answer is a. and d.