When two parents are purebred it means that they are homozygous for the characteristic that's being tested (in this case the fur colour). When they are crossed, the offspring will obligatory be heterozygous, an allele of each type from its parents. So, the trait that comes up will be the dominant trait, while the recessive trait will be hidden.
That evolution could not possibly happen in such a short period of time, but instead occurs over long amounts of time such as billions of years. Also, we did not come from monkeys we have common ancestors with them.
