| homozygous by descent | Possessing two genes at a given locus that are descended from a single source, as may occur in consanguineous mating. (05 Mar 2000) |
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| descent | Synonym: descensus. 2. In obstetrics, the passage of the presenting part of the foetus into and through the birth canal. Origin: L. Descensus (05 Mar 2000) |
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| homozygous | Containing two copies of the same allele. Compare: heterozygous (09 Oct 1997) |
| homozygous achondroplasia | A severe achondroplasia affecting progeny of two achondroplastic parents; usually fatal in the first year of life. (05 Mar 2000) |