This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Hardy Weinberg law is related to 
Select and explain. 
A. Gene therapy, B. Population genetics, C. Human genome project, D. Eugenics
B: Population genetics
Answer: B: Population genetics 
Explanation: Hardy Weinberg law: states that the genotype frequencies in a population remain constant or are in equilibrium from generation to generation unless specific disturbing influences are introduced.

Genetic equilibrium (HW law) is a basic principle of population genetics; the entire principle is based on Mendelian genetics.
Deviations in HW law:

HW law fails to apply in:

Non-random mating (assortative mating)
New mutations
Genetic drift
Gene flow
Natural selection (mortality selection, fecundity selection)
Small populations migrations
Dynamic populations.

HW law assumes that human population is static, large and has random mating.