Trait, dominant lethal
A genetic trait that, if present in the genome of the individual, is expressed and therefore precludes the individual’s having descendants. All such cases with a dominant lethal trait must necessarily be sporadic and must represent new mutations, not inherited ones because a potential parent with the trait would die and not be able to pass it along.
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- Trait, sickle cell
A person who possess one copy of the gene for sickle cell anemia. This person carries the gene but does not have the disease (or any adverse effects). If two people with sickle cell trait have children together, each of their children has a one in four chance (25%) of having sickle cell disease. A […]
- Tranquilizer
Librium), received FDA approval in 1960. Tranquilizers range in potency from mild to major, with increasing levels of drowsiness occurring as potency increases. They are prescribed for a wide variety of conditions but are used primarily to treat anxiety and insomnia. Most tranquilizers are potentially addictive, particularly those in the benzodiazepine family.
- Trans fat
An unhealthy substance, also known as trans fatty acid, made through the chemical process of hydrogenation of oils. Hydrogenation solidifies liquid oils and increases the shelf life and the flavor stability of oils and foods that contain them. Trans fat is found in vegetable shortenings and in some margarines, crackers, cookies, snack foods and other […]
- Trans fatty acid
An unhealthy substance that is made through the chemical process of hydrogenation of oils. Hydrogenation solidifies liquid oils and increases the shelf life and the flavor stability of oils and foods that contain them. Trans fatty acids are found in vegetable shortening and in some margarine, crackers, cookies, and snack foods. Trans fatty acids are […]
- Trans- (prefix)
From the Latin meaning “across, over, or beyond.” Medical terms containing “trans- ” as a prefix include transcription, transfusion, transplant, transsexual, transurethral, transvaginal, transvestism, etc.