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Genetics Terms PDF Print E-mail
Chromosome Structure in the nucleus of the cell which contains the genes responsible for heredity. Normal human cells contain twenty-three pairs of chromosomes. One of each pair is inherited separately from a person’s mother and father.
Gene Heredity unit. Each gene carries the genetic code, or blue print, for a specific protein. Each human cell has about 10,000 genes. Not all genes are active in a given cell.
Gene Mutation A faulty gene, which may result in a hereditary disease.
Recessive A mutation is said to be recessive if any individual must inherit two copies of the mutant gene, one from each parent, to develop an inherited disease. Individuals, with one mutant and one normal gene appear normal. They are called “carriers."