Without genetic variation, a population cannot evolve in response to changing environmental variables and, as a result, may face an increased risk of extinction. For example, if a population is exposed to a new disease, selection will act on genes for resistance to the disease if they exist in the population.
The genotype for both parents is Br. if using B= black and r = red
A rock that is composed of material evaporated from seawater is described as chemical.
