Homozygous

 Homozygous refers to a situation in which an individual inherits the same alleles of a gene from both parents. The allele could be dominant or recessive.

For example: Cystic Fibrosis is a condition which is characterised by thick mucus causing an obstruction in the lungs of the sufferer. Sufferers inherit the recessive allele (a mutation in the CFTR gene) for the disease from both parents. See also Albinism.