Lower the usage of industrially based travel, and perhaps more of the more environmentally-friendly public transportational methods, walking, or simply it the usage of carpooling systematic methods.
A recessive trait for the yellow gene found in the population of red squirrelfish.
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).