| homotypic | Homotypical Of the same type or form; corresponding to the other one of two paired organs or parts. (05 Mar 2000) |
|---|---|
| homotypic cortex | O. And C. Vogt's term for the larger part of the mammalian cerebral cortex, distinguished from the allocortex by being composed of a larger number of nerve cells arranged in six layers. See: cerebral cortex. Synonym: homotypic cortex, neocortex, neopallium. (05 Mar 2000) |
| homotypical | <biology> Same as Homotypal. Source: Websters Dictionary (01 Mar 1998) |
| homotypy | <biology> A term suggested by Haeckel to be instead of serial homology. See Homotype. See: Homotype. Source: Websters Dictionary (01 Mar 1998) |
| homovanillic acid | A test that measures the level of catecholamines or their metabolites in the urine. A 24 hour urine sample is necessary for this assay. Elevations may be seen in pheochromocytoma or neuroblastoma. Normal urine levels of adrenaline should be: 0.5 to 20 mcg/ml and normal urine levels of noradrenaline should be 15 to 80 mcg/ml. (27 Sep 1997) |
| homovanillic acid test | A test for homovanillic acid based upon the fact that dopamine is present in sympathetic nervous tissue as precursor of norepinephrine; since norepinephrine has a metabolic pathway which yields homovanillic acid, tumours such as neuroblastomas and ganglioneuromas may cause elevations of urinary dopamine and homovanillic acid. Synonym: HVA test. (05 Mar 2000) |
| homozoic | Relating to the same animal or the same species of animal. Origin: homo-+ G. Zoikos, relating to an animal (05 Mar 2000) |
| homozygosity | Homozygosis The state of being homozygous. Origin: homo-+ G. Zygon, yoke (05 Mar 2000) |
| homozygote | Nucleus, cell or organism with identical alleles of one or more specific genes. (18 Nov 1997) |
| 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) |
| 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) |