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complementation test
complementation test (cis-trans test) A test to determine whether two mutant sites of a gene are on the same cistron. It is performed by introducing two mutant chromosomes into the same cell and observing whether the wild-type phenotype will be expressed, which it will if each chromosome complements... Read more |
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cistron
cistron A section of the DNA molecule that specifies the formation of one polypeptide chain. A complementation test is performed to determine whether two mutant sites of a gene are in the same cistron or in different ones. In the cis configuration, both mutants are on one homologous chromosome and... Read more |
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Esophageal function tests
Esophageal function tests Definition The esophagus is the muscular tube through which food passes on its way from the mouth to the stomach. The main function of the esophagus is to propel food into the stomach. To ensure that food does not move backward—a condition known as... Read more |
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Elimination diet
Elimination diet Definition An elimination diet functions as a test, determining whether patients may have a sensitivity to certain foods. Initially, patients stop eating foods suspected of causing illness. Then, after a suitable period of time (often 10 |
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Hardy-Weinberg law
Hardy-Weinberg Equilibrium The Hardy-Weinberg equilibrium is the statement that allele frequencies in a population remain constant over time, in the absence of forces to change them. Its name derives from Godfrey Hardy, an English mathematician, and Wilhelm Weinberg, a German physician, who... Read more |
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chi-square test
chi-square test (ky-skwair) n. (in statistics) a test to determine if the difference between two groups of observations is statistically significant (see significance), used in controlled trials and other studies. It measures the differences between theoretical and observed frequencies (see... Read more |
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verdict
verdict in law, official decision of a jury respecting questions of fact that the judge has laid before it. In the United States, verdicts must be unanimous in federal courts, but majority verdicts are constitutionally permissible in state courts. The jury may be instructed to render a general... Read more |
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Alcmaeon
ALCMAEON OF CROTON(c. 540–500 BCE) Alcmaeon of Croton (a Greek city-state in southern Italy) was a pioneer in the study of human psychology and physiology. He published one book in the late sixth or first half of the fifth century BCE. Only two or three fragments of the book survive, but... Read more |
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Boolean algebra
Boolean algebra , an abstract mathematical system primarily used in computer science and in expressing the relationships between sets (groups of objects or concepts). The notational system was developed by the English mathematician George Boole c.1850 to permit an algebraic manipulation of... Read more |
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War Memorials
Memorials, War. Wars are commemorated by an immense variety of devices—obelisks, monoliths, marble temples, battlefields and battle markers, statues, cemeteries, tombs, memorial chapels and parks, plaques and walls bearing the names of the dead, place names, and “living... Read more |
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