In humans, having brown hair is dominant to having blond hair. How is it possible that two brown-haired parents have a blond-haired child? Both parents have brown hair but their genotype is homozygous. Both parents have brown hair but their genotype is heterozygous. One parent has an allele for blond hair that was passed on to the child. The brown hair alleles changed to blond hair when inherited by the child.

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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.