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Failure to separate properly during cell division
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division (mitosis/meiosis). There are three
Nondisjunction
Chromosomes that pair in fertilization
II. A failure to separate properly is known as nondisjunction. There are two main types of nondisjunction that occur: trisomy and monosomy. Trisomy is caused
Homologous_chromosome
Chromosome disorder in women
called nondisjunction, in which normal cell division is interrupted and produces gametes with too many or too few chromosomes. Nondisjunction is a random
Trisomy_X
Cell division producing haploid gametes
approximately 27 times on average. Errors during meiosis, particularly nondisjunction, can result in gametes with an abnormal number of chromosomes, potentially
Meiosis
Chromosomal disorder
diagnosis is reached. Pentasomy X is not inherited but rather occurs via nondisjunction, a random event in gamete development. The karyotype observed in pentasomy
Pentasomy_X
designation (46,XX). Trisomy 21 (47,XY,+21) is caused by a meiotic nondisjunction event. A typical gamete (either egg or sperm) has one copy of each chromosome
Genetics_of_Down_syndrome
Human chromosomal condition
nondisjunction event during paternal meiosis I, maternal meiosis I, or maternal meiosis II, also known as gametogenesis. The relevant nondisjunction in
Klinefelter_syndrome
Chromosomal disorder in which there are three copies of chromosome 13
caused by nondisjunction of chromosomes during meiosis; the mosaic form is caused by nondisjunction during mitosis. Like all nondisjunction conditions
Patau_syndrome
Chromosomal disorder
not caused by characteristics of the parents, but rather occurs via nondisjunction, a random event in gamete development. The karyotype observed in the
XXXYY_syndrome
Chromosomal disorder with 4 X chromosomes
generally not inherited but rather occurs via a random event called nondisjunction during gamete or zygote development. The formal term for the karyotype
Tetrasomy_X
Presence of an abnormal number of chromosomes in a cell
when the chromosomes do not separate properly between the two cells (nondisjunction). Most cases of aneuploidy in the autosomes result in miscarriage, and
Aneuploidy
Extra X and Y chromosome in males
reproductive cells (eggs and sperm). An error in cell division called nondisjunction results in a reproductive cell with an abnormal number of chromosomes
XXYY_syndrome
Condition in multi-cellular organisms
mosaicism can result from many different mechanisms including chromosome nondisjunction, anaphase lag, and endoreplication. Anaphase lagging is the most common
Mosaic_(genetics)
Chromosomal disorder in which there are three copies of chromosome 18
than two. Trisomy 18 (47,XX,+18) is caused by a meiotic nondisjunction event. In nondisjunction, a pair of chromosomes fails to separate during cell division;
Trisomy_18
Third stage of mitosis and meiosis
ending with the destruction of B cyclin. In order to prevent deleterious nondisjunction events, a key cell cycle checkpoint, the spindle checkpoint, verifies
Metaphase
Medical condition
phenomenon can be caused by trisomy rescue. Maternal UPD arises from nondisjunction in oocyte and causes trisomy when it gets fertilised, there will be
Temple_syndrome
Chromosomal anomaly
Medical genetics Usual onset Prenatal Duration Lifelong Causes Cellular nondisjunction during meiosis Diagnostic method Karyotype Frequency 1 in 85,000 to
XXXXY_syndrome
Cell division into two identical cells
mitosis), resulting in severe errors in their chromosomal complements. In nondisjunction, sister chromatids fail to separate during anaphase. One daughter cell
Mitosis
Medical condition
two X chromosomes and one Y chromosome. This would be caused by two nondisjunction events in spermatogenesis, both meiosis I and meiosis II. The duplicated
XXXY_syndrome
Abnormal number or structure of chromosomes
segregation errors such as nondisjunction, premature disjunction, or anaphase lag during meiosis I or II. For aneuploidy, nondisjunction, the most frequent error
Chromosome_abnormality
Egg cell abnormalities
successful chromosome segregation. If this does not occur it can result in nondisjunction and aneuploidy. There are several factors that contribute towards failed
Oocyte_abnormalities
DNA molecule containing genetic material of a cell
– explains gene location nomenclature Minichromosome Neochromosome Nondisjunction Parasitic chromosome Polytene chromosome Secondary chromosome Sex-determination
Chromosome
Genetic disorder
21st chromosome to separate during egg or sperm development, known as nondisjunction. As a result, a sperm or egg cell is produced with an extra copy of
Down_syndrome
Abnormal presence of three copies of a particular chromosome
Freeman, S; Sherman, S (1995). "Recombination and maternal age-dependent nondisjunction: molecular studies of trisomy 16". American Journal of Human Genetics
Trisomy
X chromosome monosomy
occurs, the X chromosome comes from the mother. This may be due to a nondisjunction in the Mother. Meiotic errors that lead to the production of X with
Turner_syndrome
Inability to sexually reproduce
mosaics. Loss of part of a chromosome can also cause sterility due to nondisjunction. XX male syndrome is another cause of sterility, wherein the sexual
Sterility_(physiology)
Partial or complete triplication of chromosome 16
Specialty Medical genetics Duration Lifelong Types Full, mosaic Causes Nondisjunction Diagnostic method Chorionic villus sampling, amniocentesis Prognosis
Trisomy_16
Any chromosome other than a sex chromosome
can arise due to a number of causes, some of the most common being nondisjunction in parental germ cells or Mendelian inheritance of deleterious alleles
Autosome
Complete set of nucleic acid sequences for humans
syndrome, Turner Syndrome, and a number of other diseases result from nondisjunction of entire chromosomes. Cancer cells frequently have aneuploidy of chromosomes
Human_genome
Genetic disorder
neural tube defects, heart defects Duration Lifelong Types Full, mosiac Causes Nondisjunction Diagnostic method Karyotype Prognosis Incompatible with life
Monosomy_14
Congenital disorder of the reproductive system
meiosis signalling to germ cells during embryogenesis may result in nondisjunction and monosomy X from not occurred separation of chromosomes in either
Gonadal_dysgenesis
strand. nondisjunction The failure of homologous chromosomes or sister chromatids to segregate properly during cell division. Nondisjunction results in
Glossary of cellular and molecular biology (M–Z)
Glossary_of_cellular_and_molecular_biology_(M–Z)
Condition where cells have more than two sets of chromosomes
taxa result in abnormal pairing between homoeologous chromosomes or nondisjunction during meiosis. In this case, allopolyploidy can actually restore normal
Polyploidy
Genetic condition in which a male has an extra Y chromosome
in chromosome separation during anaphase II (of meiosis II) called nondisjunction can result in sperm cells with an extra copy of the Y-chromosome. If
XYY_syndrome
Duplication of a gene sequence within a genome
chromosomes to shape chromosomal evolution. Aneuploidy occurs when nondisjunction at a single chromosome results in an abnormal number of chromosomes
Gene_duplication
Medical condition
begins to regress and the cells merge. This is thought to be caused by nondisjunction in chromosomes but the mechanism by which it occurs is not well understood
Binucleated_cells
Nonsexual mechanism for transferring genetic material without meiosis
genes on chromosomes; while haploidization probably involves mitotic nondisjunctions which randomly reassort the chromosomes and result in the production
Parasexual_cycle
Photographic display of total chromosome complement in a cell
abnormalities, also known as aneuploidy, often occur as a result of nondisjunction during meiosis in the formation of a gamete; trisomies, in which three
Karyotype
Logical operation
in place of the stroke. Sheffer interpreted the stroke as a sign for nondisjunction (NOR) in his paper, mentioning non-conjunction only in a footnote and
Sheffer_stroke
Immature ovum or egg cell
responsible for maintaining the microtubule system. See anatomy of sperm Nondisjunction—a failure of proper homolog separation in meiosis I, or sister chromatid
Oocyte
Chemical compound
function of pulling chromosomes into the daughter cell, also known as nondisjunction of chromosomes. Demecolcine, depending on dose, has also been found
Demecolcine
Sex chromosome in the XY sex-determination system
produce Y gametes, or gametes devoid of any sex chromosome, through nondisjunction. Outside of the rodents, the black muntjac, Muntiacus crinifrons, evolved
Y_chromosome
Aspect of microbiology
an outer host cell simultaneously. Aneuploidy, a condition in which nondisjunction gives rise to gametes with an abnormal number of chromosomes, is one
Entosis
Small nucleus in the cells of some organisms
fragments caused by incorrectly repaired or unrepaired DNA breaks or by nondisjunction of chromosomes. This improper segregation of chromosomes may result
Micronucleus
enjoinment, injunction, injunctive, join, junction, juncture, junta, junto, nondisjunction, nonjoinder, rejoin, rejoinder, sejoin, sejungible, subjoin, subjoinder
List of Greek and Latin roots in English/H–O
List_of_Greek_and_Latin_roots_in_English/H–O
All Latin roots beginning with J
enjoinment, injunction, injunctive, join, junction, juncture, junta, junto, nondisjunction, nonjoinder, rejoin, rejoinder, sejoin, sejungible, subjoin, subjoinder
List of Greek and Latin roots in English/J
List_of_Greek_and_Latin_roots_in_English/J
Condition caused by four copies of the short arm of chromosome 12
maternal eggs; 2) while most of the eggs with this nondisjunction die, a rare egg with the nondisjunction acquires a second structural aberration, isochromosome
Pallister–Killian_syndrome
trisomic rescue: SNP array typing provides new insights in chromosomal nondisjunction". Molecular Cytogenetics. 10 (28): 28. doi:10.1186/s13039-017-0329-1
Trisomic_rescue
isolation nondisjunction The failure of homologous chromosomes or sister chromatids to segregate properly during cell division. Nondisjunction results in
Glossary of genetics and evolutionary biology
Glossary_of_genetics_and_evolutionary_biology
Early embryonic cell
does not split evenly between the two daughter cells, an event called "nondisjunction" occurs. Since this event occurs in only one of the several cells that
Blastomere
contrast, an accumulation of B chromosomes in plants by a directional nondisjunction in mitoses before or after meiosis has been observed in many cases,
Non-random segregation of chromosomes
Non-random_segregation_of_chromosomes
Phenomenon that results in unusual rearrangement of an chromosomes
known as a 'translocation Downs'. This is due to a mis-segregation (nondisjunction) during gametogenesis. The mother has a higher (10%) risk of transmission
Chromosomal_translocation
Events leading to cell division
control at the metaphase/anaphase transition: a mechanism of meiotic nondisjunction in mammalian females". The Journal of Cell Biology. 139 (7): 1611–1619
Cell_cycle
Third stage of Prophase I of Meiosis
segregation in meiosis. Defects at this stage can lead to aneuploidy and nondisjunction. Snustad DP, Simmons MJ (December 2008). Principles of Genetics (5th ed
Pachytene
Dutch track and field athlete (1926–2007)
genotype that promptly divided into a half XX, half XY embryo through nondisjunction. Dillema was probably a 46XX/46XY woman. This can result in an ovotesticular
Foekje_Dillema
Branch of genetics
chromosomal defect: a "simple" trisomy. Abnormalities arising from nondisjunction events can cause cells with aneuploidy (additions or deletions of entire
Cytogenetics
translocation heterozygotes, nondisjunction of homologous centromeres occurs at a measurable but low rate. This nondisjunction produces an adjacent-2 segregation
Pseudolinkage
Medical condition
can be caused by monosomy rescue. Usually Paternal UPD arises from nondisjunction in oocyte which causes nullisomy of that chromosome. When such oocyte
Kagami–Ogata_syndrome
Modifying synaptic strength via cell adhesion molecules
pp. 659–669. ISBN 978-0-12-397266-8. Flannery DB (September 1988). "Nondisjunction in Down syndrome". American Journal of Medical Genetics. 31 (1): 181–2
Synaptic_stabilization
Genetic recombination between identical or highly similar strands of genetic material
chromosomes to fail to properly segregate in a process called nondisjunction. In turn, nondisjunction can cause sperm and ova to have too few or too many chromosomes
Homologous_recombination
Presence of four copies of the short arm of chromosome 9
incorrect distribution of chromosomes during meiosis or mitosis, called nondisjunction. When cell division occurs normally, each daughter cell receives one
Tetrasomy_9p
Abnormal partial or mixed chromosome
XY,+der(22)t(11;22) for males. The sSMC in ES forms as a result of a nondisjunction, i.e. failure, of the parent's derivative chromosome to separate from
Small supernumerary marker chromosome
Small_supernumerary_marker_chromosome
Abnormal multiples of one or more chromosomes
including fusion of the centromere, or centric fusions. Aneuploidy due to nondisjunction is a common feature in tumor cells. Some of the most frequent genetic
Polysomy
Butterflies in swallowtail family
suspected to be due to genetic errors associated with cell division such as nondisjunction, as well as fertilization of binucleate ova and fertilisation of multiple
Birdwing
Sex-specific patterns of inheritance
aneuploidy is not an inherited condition (and instead arises due to nondisjunction of the sex chromosomes during meiosis) in individuals with an abnormal
Sex_linkage
Genotoxic assay in fruit fly
mutations/deletions, nondisjunction, and homologous mitotic recombination might theoretically cause this loss of heterozygosity, nondisjunction processes are
Somatic mutation and recombination tests
Somatic_mutation_and_recombination_tests
American biogerontologist (1927–2022)
S2CID 34390842. Martin, G. M.; Sprague, C.; Bryant, J. S. (1967-05-06). "Mitotic nondisjunction in cultivated human cells". Nature. 214 (5088): 612–613. Bibcode:1967Natur
George_M._Martin
Cell cycle checkpoint
occurs through an incomplete separase cycle that results in frequent nondisjunction events which amplify aneuploidy in cancer cells. Advances in this field
Spindle_checkpoint
Presence of four copies of the short arm of chromosome 18
Castellan C, Braun-Quentin C, Pfeiffer RA, Schinzel A. 1996. Isochromosome 18p results from maternal meiosis II nondisjunction. Eur J Hum Genet 4:168–174.
Tetrasomy_18p
nitrogen cycle – non-competitive inhibition – non-cyclic electron flow – nondisjunction – N-terminus – nuclear lamina – nucleolus – nucleon – nucleoside – nucleosome
Index_of_biology_articles
Malaysian microbiologist
during meiosis. Disruption of these genes in the deletion strains led to nondisjunction. Tham also participated in identifying the protein FPR3 as a member
Wai-Hong_Tham
under‑replicated DNA. They need the MiDAS to complete replication, avoid nondisjunction and chromosome segregation errors, and maintain the genome’s potential
Mitotic_DNA_Synthesis
Canadian scientist and Down Syndrome researcher
and she found strong evidence that abdominal x-ray exposure led to nondisjunction in their pregnancies and risk of birth defects. In 1970, Dr. Uchida
Irene_Uchida
MeSH G05.105.220.625 – chromosome segregation MeSH G05.105.220.625.620 – nondisjunction, genetic MeSH G05.105.220.687 – meiosis MeSH G05.105.220.687.500 – meiotic
List_of_MeSH_codes_(G05)
210.570 – micronuclei, chromosome-defective MeSH C23.550.210.645 – nondisjunction, genetic MeSH C23.550.210.645.890 – uniparental disomy MeSH C23.550
List_of_MeSH_codes_(C23)
NONDISJUNCTION
NONDISJUNCTION
NONDISJUNCTION
NONDISJUNCTION
Boy/Male
Christian & English(British/American/Australian)
A Freeman
Boy/Male
Arabic
Independent; Prosperous
Boy/Male
Bengali, Hindu, Indian
Sweet; Lovely
Male
Romanian
Romanian form of Visigothic Frithnanth, NANDRU means "ardent for peace."
Boy/Male
Hindu
Lord Vishnu
Surname or Lastname
English (Cambridgeshire)
English (Cambridgeshire) : variant spelling of Munsey.
Girl/Female
English Greek
Defender of mankind. Feminine of Alexander.
Male
Dutch
, law power.
Girl/Female
Greek Muslim
From Sheba.
Surname or Lastname
English
English : unexplained.
NONDISJUNCTION
NONDISJUNCTION
NONDISJUNCTION
NONDISJUNCTION
NONDISJUNCTION