Effect, founder
Effect, founder: The positive effect on gene frequency when a population (colony) has only a small number of original settlers, one or more of whom had that gene. For example, the gene for Huntington’s disease was introduced into the Lake Maracaibo region in Venezuela early in the nineteenth century. This is now the largest known aggregation of the Huntington’s gene in the world.
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- Effective dose
Effective dose: The dose of a drug that will achieve the desired effect.
- Effects, fetal rubella
Effects, fetal rubella: The constellation of abnormalities, also called the rubella syndrome, caused by infection with the rubella (German measles) A virus before birth. The syndrome is characterized by multiple congenital malformations (birth defects) and mental retardation. The individual features of the syndrome include growth retardation, microcephaly (abnormally small head), cataracts, glaucoma, microphthalmia (abnormally small […]
- Efferent
Efferent: Carrying away. For example, an artery is an efferent vessel that carries blood away from the heart, and an efferent nerve carries impulses away from the central nervous system. The opposite of efferent is afferent.
- Efferent nerve
Efferent nerve: A nerve that carries impulses away from the central nervous system.
- Efferent vessel
Efferent vessel: A vessel that carries blood away from the heart. Hence, an efferent vessel is an artery or an arteriole (a little artery).