The correct option is A Algebraic equation
According to the Hardy-Weinberg principle, allele frequencies in a population are stable and constant from generation to generation and the complete gene pool will remain constant.
The Hardy-Weinberg principle is stated by using an algebraic equation p+q=1, where p is the allele frequency of one allele (example ‘A’) and q is the frequency of another allele (example ‘a’) which is always equals to one. It is expanded using the binomial theorem intop2+2pq+q2=1.