nondisjunction
61Non-Disjunction — Unter dem Begriff Non disjunction (engl.: disjunction = Trennung), auch Nondisjunction und unter dem Synonym Fehlsegregation bekannt, versteht man in der Genetik das fehlende Auseinanderweichen von zwei homologen Chromosomen bei der Meiose I oder …
62Геном человека/temp — Геном человека это геном биологического вида Homo sapiens . В нормальной ситуации у человека может присутствовать 24 различных хромосомы (22+X+Y): 22 из них не зависят от пола (аутосомные хромосомы), 2 X хромосома и Y хромосома зависят от пола.… …
63disjunction mutant — Drosophila mutant in which chromosomes are partitioned unequally between daughter cells at meiosis, as a result of nondisjunction …
64nondisjunctional — See nondisjunction. * * * …
65polyploidy — See polyploid. * * * ▪ genetics the condition in which a normally diploid cell or organism acquires one or more additional sets of chromosomes. In other words, the polyploid cell or organism has three or more times the haploid chromosome… …
66diagnosis — /duy euhg noh sis/, n., pl. diagnoses / seez/. 1. Med. a. the process of determining by examination the nature and circumstances of a diseased condition. b. the decision reached from such an examination. Abbr.: Dx 2. Biol. scientific… …
67heredity — /heuh red i tee/, n., pl. heredities. Biol. 1. the transmission of genetic characters from parents to offspring: it is dependent upon the segregation and recombination of genes during meiosis and fertilization and results in the genesis of a new… …
68Down syndrome — A common chromosome disorder due to an extra chromosome number 21 (trisomy 21). Down syndrome causes mental retardation, a characteristic face, and multiple malformations. Down syndrome is a relatively common birth defect. The chromosome… …
69disjunction — The normal separation of pairs of chromosomes at the anaphase stage of meiosis I or II. [dis + L. junctio, a joining, fr. jungo, pp. junctum, to join] * * * dis·junc·tion dis jəŋ(k) shən n the separation of chromosomes or chromatids during… …
70polysomy — State of a cell nucleus in which a specific chromosome is represented more than twice. Cells containing three, four, or five homologous chromosomes are referred to, respectively, as trisomic, tetrasomic, or pentasomic. Cf.:polyploidy. [poly + G.… …
