Populations: The Hardy-Weinberg Principle

Species are composed of one or more populations.
A population is a group of the same species living in the same area at the same time that can potentially interbreed.
Concepts include gene pool and allele frequency.
The Hardy-Weinberg principle is a mathematical model predicting no change in allele frequencies between generations.
The principle only applies under certain conditions.
The Hardy-Weinberg equation can be used to determine frequencies of alleles, genotypes, and phenotypes in a population.
Practice is recommended for using this equation, as it can be difficult to understand.