Expression, gene
Expression, gene: The translation of information encoded in a gene into protein or RNA structures that are present and operating in the cell. Expressed genes include genes that are transcribed into messenger RNA (mRNA) and then translated into protein, as well as genes that are transcribed into RNA, such as transfer and ribosomal RNAs, but not translated into protein.
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- Expressivity
Expressivity: The consistency of a genetic disease. For example, Marfan syndrome shows variable expressivity. Some persons with Marfan syndrome merely have long fingers and toes, and others have the full-blown disease, with dislocation of the lens and dissecting aneurysm of the aorta.
- Expulsion, stage of
Expulsion, stage of: The second stage of labor, lasting from the full dilation of the cervix until the baby is completely out of the birth canal.
- Exstrophy
Exstrophy: Eversion of a hollow organ at birth. An exstrophic bladder is one that is turned inside out like a rubber glove. In exstrophy of the cloaca (a primitive embryonic structure) an area of the intestine is interposed between two separate areas of the bladder. The word exstrophy is from the Greek ex, out, + […]
- Extended family
Extended family: The family group consisting not only the nuclear family (the parents and their children) but also embracing the grandparents, aunts, uncles, cousins, and sometimes more distant relatives.
- Extension
Extension: The process of straitening or the state of being strait. Extension of the hip and knee joints is necessary to stand up from the sitting position.