| Mendel's first law | Factors that affect development retain their individuality from generation to generation, do not become contaminated when mixed in a hybrid, and become sorted out from one another when the next generation of gametes is formed. Synonym: Mendel's first law. (05 Mar 2000) |
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| Mendel's instep reflex | The foot being firmly supported on its inner side, a sharp tap on the dorsal tendons causes extension of the second to the fifth toes. Synonym: back of foot reflex, dorsum of foot reflex. (05 Mar 2000) |
| Mendel's laws | <genetics> The two basic principles of genetics proposed by Gregor Mendel. The law of segregation, which states that the alleles governing a trait are separated during the creation of gametes (meiosis). The law of independent assortment, which states that the genes controlling different traits are distributed separately from each other during meiosis. (13 Nov 1997) |
| Mendel's second law | Different hereditary factors assort independently when the gametes are formed; traits at linked loci are an exception. Synonym: Mendel's second law. (05 Mar 2000) |
| Mendel, Gregor | <person> Austrian geneticist, 1822-1884. See: mendelian character, mendelian inheritance, mendelian ratio, Mendel's first law, Mendel's second law. (05 Mar 2000) |
| Mendel, Gregor Johann | <person> An Austrian monk and botanist. His breeding experiments on garden peas and subsequent formulation of the laws of heredity formed the basis for the field of genetics. Lived: 1822-1884. (13 Nov 1997) |
| Mendel, Kurt | <person> German neurologist, 1874-1946. See: Mendel's instep reflex, Bechterew-Mendel reflex. (05 Mar 2000) |
| Mendel-Bechterew reflex | Percussion of the dorsum of the foot causes flexion of the toes; present in a pyramidal lesion. Synonym: dorsum pedis reflex, Mendel-Bechterew reflex. (05 Mar 2000) |
| Mendeleeff's law | The properties of elements are periodical functions of their atomic weights; i.e., if the elements are arranged in the order of their atomic weights, every element in the series will be related in respect to its properties to the eighth in order before or after it. Synonym: periodic law. (05 Mar 2000) |
| Mendeleeff, Dimitri | <person> Russian chemist, 1834-1907. See: mendelevium, Mendeleeff's law. (05 Mar 2000) |
| mendelevium | <chemical> Mendelevium. A man-made radioactive element of the actinide family with atomic symbol md, atomic number 101, and atomic weight 258. Chemical name: Mendelevium (12 Dec 1998) |
| mendelian | Referring to the Austrian monk Gregor Mendel (1822-84) who formulated laws forming the foundation of classical genetics. (12 Dec 1998) |
| mendelian character | An inherited character under the control of a single locus (although perhaps modified by genes at other loci). (05 Mar 2000) |
| mendelian genetics | The study of the pattern of segregation of phenotypes under the control of genetic loci taken one at a time. (05 Mar 2000) |
| Mendelian inheritance | <genetics> Inheritance of characters according to the classical laws formulated by Gregor Mendel, which give the classic ratios of segregation in the F2 generation. In sexually reproducing organisms, any process of heredity explicable in terms of chromosomal segregation, independent assortment and homologous exchange. (18 Nov 1997) |
| Bechterew-Mendel reflex | Percussion of the dorsum of the foot causes flexion of the toes; present in a pyramidal lesion. Synonym: dorsum pedis reflex, Mendel-Bechterew reflex. (05 Mar 2000) |
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| Gregor Mendel | <person> An Austrian monk and botanist. His breeding experiments on garden peas and subsequent formulation of the laws of heredity formed the basis for the field of genetics. Lived: 1822-1884. (13 Nov 1997) |