Genetic variation . Genetic variation . is created by the direct action of natural selection tends to be reduced by when diploid organisms produce gametes arises in response to changes in the environment must be present in a population before natural selection can act upon the population

Natural selection can act on traits determined by alternative alleles of a single gene ... hope this helps, this is one of many answers for this question!

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.  

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