NCI Dictionary of Genetics Terms
Welcome to the NCI Dictionary of Genetics Terms, which contains technical definitions for more than 150 terms related to genetics. These definitions were developed by the PDQ® Cancer Genetics Editorial Board to support the evidence-based, peer-reviewed PDQ cancer genetics information summaries.
- homozygous genotype
- listen (HOH-moh-ZY-gus JEE-noh-tipe)
Occurs when both alleles at a particular gene locus are the same. A person may be homozygous for the normal allele or for a mutation.