Failure of homologous chromosomes (at meiosis) or sister chromatids (at mitosis) to segregate properly, resulting in unequal distribution to daughter cells. A commonly error leading to chromosomal disease.
an error that occurs during the division of sex chromosomes, causing either too much or too little genetic information to be placed in an egg or sperm when it is formed
failure to separate chromatids of a given chromosome during cell division. In mitosis the centromere is not broken during anaphase resulting in both chromatids going to the same daughter cell. In meiosis one of two events may occur: 1) synapsed homologous chromosomes (tetrads) fail to separate during anaphase I; 2) failure to break the centromere of a chromatid pair (diad) during anaphase II resulting in both chromatids going to the same daughter cell.
Failure of sister chromatids to separate in meiosis II or mitosis, or failure of homologous chromosomes to separate in meiosis I. Results in aneuploidy.
Occurs when a pair of homologous chromosomes fails to separate during gamete formation. The offspring produced from these gametes have either one too many or one too few of a particular chromosome. Nondisjunction is the cause of genetic disorders such as Down syndrome.
meiosis in which there is a failure of paired homologous chromosomes to separate; results in an abnormal number of chromosomes in the daughter cells
NON-dis-JUNK-shun Unequal partition of chromosomes into gametes during meiosis. 298
Failure of two chromosomes to separate subsequent to meta phase in meiosis or mitosis so that one daughter cell has both/and the other, neither of the chromosomes.
Failure of a pair of homologous chromosomes to separate during meiosis, leading to one gamete with n + 1 chromosomes (see trisomy) and another gamete with n _ 1 chromosomes.
A condition where a chromosome does not separate properly, leading to an extra or missing chromosome in cells.
The failure of homologous chromosomes to segregate into each daughter cell during mitotic or meiotic anaphase. i.e. both members of a pair move to the same daughter cell, resulting in deficiency in one cell and excess in the other.
The failure of chromosomes to separate properly during cell division. The unequal segregation of chromosomes during meiosis. This forms cells with either too many (possibly one or more single or sets of chromosomes too many) or too few chromosomes. Thought to be a common cause for Down Syndrome, where sufferers often have an extra copy of chromosome 21.
failure of two homologous chromosomes to pass to separate cells during the first division of meiosis, or the two chromatids to pass to separate cells during the second meiotic division. As a result, one daughter cell has two chromosomes or chromotids while the other has none oligohydramnios: decreased amniotic fluid volume
the failure of homologous chromosomes in meiosis I or sister chromatids in meiosis II to separate properly and to move to opposite poles; results in one daughter cell receiving both and the other daughter receiving none of the chromosomes in question
The failure of homologous chromosomes to separate during meiosis.
an error in cell division where the chromosomes fail to disjoin, so that both pass to the same daughter cell.
failure of sister chromatids or homologous chromosomes to separate properly during anaphase of mitosis (or equatorial division of meiosis) or reductional division of meiosis; both pass to the same daughter cell
Nondisjunction is the failure of homologous chromosomes to properly segregate during meiotic or mitotic anaphase, resulting in daughter cells with abnormal numbers of chromosomes. Nondisjunctions can result in diseases or abnormalities, and occasionally aid in adaptation and speciation.