As a result, the gene no longer makes a proper copy of the protein it codes for. A membrane-enclosed part of the cell where chromosomes, containing all the cell's genes, reside. Long strings of DNA consist of subunits, called nucleotides. It takes three nucleotides to code for one amino acid. A metabolic disorder of the skeletal system, in which bone resorption outpaces bone formation or replacement.
Bones break easily because they become porous and brittle.
A common crippling disease characterized by muscle spasms and rigidity, tremors, slow movements and loss of control over many parts of the body. The disease was named after a British physician who observed it in 1817. It is caused by a dopamine deficiency that prevents certain brain cells from performing their normal duties, but no one knows what causes the deficiency. An organism that causes disease, such as a virus or bacteria. A technique used to determine whether an embryo carries a genetic disease.