A population of rabbits begins off with only two type of alleles, brown and dark brown rabbits. Eventually this will change throughout seasons and time.
Differental Survival and Reproduction
A few other rabbits came along and mated with each other, suddenly there was a mutation. There were now different colored rabbits, white, gray, brown, and dark brown. These traits are genetic traits that are inherited from their parents.
Change in the Gene Pool
Two wolves appear and it easily spots the mutated rabbits, given its variation. Ultimately, the light colored rabbits will have a less chance at surviving since the environment is dark.
Nevertheless, an environmental transformation has resulted; therefore, this is allowing the mutated rabbits to have a better chance at camouflaging itself into its surroundings.
By the reason of the disparity among the initial allele, the dark colored rabbits are now more defenseless to the predators considering that they can now be distinguishable in their habitat.
Since both original alleles have now unhurriedly faded away from the overall rabbit population, the mutated rabbits, whose traits are best adapted to the environment, have survived long enough to mate and reproduce.