Fitness describes the capability of an individual of certain genotype to reproduce, and usually is equal to the proportion of the individuals genes in all the genes of the next generation. If differences in individual genotypes affect fitness, then the frequencies of the genotypes will change over generations; the genotypes with higher fitness become more common. This process is called natural selection.
Fitness describes the capability of an individual of certain genotype to reproduce, and usually is equal to the proportion of the individuals genes in all the genes of the next generation. If differences in individual genotypes affect fitness, then the frequencies of the genotypes will change over generations; the genotypes with higher fitness become more common. This process is called natural selection.