Explain Hardy-Weinberg equilibrium in terms of allelic and genotypic frequencies and relate these to the expression (p+q)^2 = P^2 + 2pq + q^2=1

1. explain Hardy-Weinberg equilibrium in terms of allelic and genotypic frequencies and relate these to the expression (p+q)^2 = P^2 + 2pq + q^2=1

2. Explain the conditions necessary to maintain Hardy-weinberg equilibrium.