Variations of a given gene.
The frequency with which a particular allele appears among the possible alleles in a population.
The probability that an individual will contribute its genes to the next generation.
Random changes in allelic frequencies due to chance rather than selection.
An equation used to find the allele frequencies in a population at Hardy-Weinberg equilibrium. For a two allele system, the Hardy-Weinberg equation would be (p + q)2 = 1 or p2 +2pq + q2 = 1.
A state in which phenotypic and allelic frequencies remain constant from generation to generation in sexually reproducing populations.
The theory holding that competition exists within species, determining which species live to have offspring and pass their traits on to those offspring.
The traits or characteristics an individual displays.