nucleolar chromosome - définition. Qu'est-ce que nucleolar chromosome
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  3. nucleolar chromosome

Qu'est-ce (qui) est nucleolar chromosome - définition

A REGION OF A CHROMOSOME WHERE NUCLEOLI FORM DURING INTERPHASE, AND WHERE GENES ENCODING THE LARGEST RRNA PRECURSOR TRANSCRIPT ARE TANDEMLY ARRAYED.
Nucleolar organizer; Nucleolar organizer region; Nucleolar Organizing Regions; Nucleolar Organizing Region; Nucleolar Organization Region; Nucleolar organization region; Nucleolar organizer regions; Nucleolar organizing regions; Nucleolar organizing region
  • [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4973289/figure/MCSTAYGAD283838F1/ The location of NORs and the nucleolar cycle in human cells.]
  • [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3847771/figure/F4/ The DJ forms a perinucleolar anchor for rDNA repeats.]
  • Silver-stained nucleolus organizer region (arrow) at the tip of a chromosome of the Gecko ''[[Lepidodactylus lugubris]]''

Chromosome abnormality         
  • trisomy 21]], showing three copies of chromosome 21.
  • Karyotype}}
  • The three major single-chromosome mutations: deletion (1), duplication (2) and inversion (3).
  • pmc=6954653 }}<br>- "This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/)"</ref>
  • The two major two-chromosome mutations: insertion (1) and translocation (2).
ABNORMAL NUMBER OR STRUCTURE OF CHROMOSOMES
Chromosomal aberration; Chromosomal Disorder; Chromosomal abnormalities; Chromosome aberration; Chromosomal abnormality; Chromosomal disorders; Chromosopathy; Chromosomal disease; Chromosomal anomaly; Chromosomal anomalies; Chromosome anomaly; Chromosome anomalies; Chromosome aberrations; Chromosomal aberrations; Chromosomal aberation; Chromosomal aberations; Chromosome aberations; Chromosome abberration; Chromosome abberrations; Chromosomal abberration; Chromosomal abberrations; Chromosomal abberation; Chromosomal abberations; Chromosome abberation; Chromosome abberations; Chromosome disorder; Chromosome disorders; Chromosomal diseases; Chromosome disease; Chromosome diseases; Cytogenetic abnormality; Cytogenetic abnormalities; Chromosomal disorder; Chromosome abnormalities; Chromosomal mutation; Chromosome mutation; Chromosomal condition; Chromosomal problem; Chromosome problem; Nomenclature of chromosome abnormalities
A chromosomal abnormality, chromosomal anomaly, chromosomal aberration, chromosomal mutation, or chromosomal disorder, is a missing, extra, or irregular portion of chromosomal DNA.NHGRI.
https://en.wikipedia.org/wiki/Chromosome_abnormality
Y chromosome microdeletion         
MALE STERILITY DUE TO CHROMOSOME Y DELETION IS CHARACTERIZED BY A SEVERE DEFICIENCY OF SPERMATOGENESIS. CHROMOSOME Y DELETIONS ARE A FREQUENT GENETIC CAUSE OF MALE INFERTILITY.
Y Chromosome Microdeletion; Y chromosome deletions; Y chromosome deletion
Y chromosome microdeletion (YCM) is a family of genetic disorders caused by missing genes in the Y chromosome. Many men with YCM exhibit no symptoms and lead normal lives.
https://en.wikipedia.org/wiki/Y_chromosome_microdeletion
X chromosome         
  • 450x450px
  • 602x602px
  • 833x833px
  • The number of possible ancestors on the X chromosome inheritance line at a given ancestral generation follows the Fibonacci sequence. (After Hutchison, L. "Growing the Family Tree: The Power of DNA in Reconstructing Family Relationships".<ref name="xcs"/>)
SEX CHROMOSOME PRESENT IN BOTH SEXES, OF SPECIES IN WHICH THE MALE IS THE HETEROGAMETIC SEX
Chromosome X (human); Chromosomes, human, x; X chromosomes; X-chromosome; X Chromosome; Chromosome X; Human chromosome X; Human X chromosome; X chromosome (human); Unguarded X hypothesis
(X chromosomes)
An X chromosome is one of an identical pair of chromosomes found in a woman's cells, or one of a non-identical pair found in a man's cells. X chromosomes are associated with female characteristics. Compare Y chromosome
.
N-COUNT

Wikipédia

Nucleolus organizer region

Nucleolus organizer regions (NORs) are chromosomal regions crucial for the formation of the nucleolus. In humans, the NORs are located on the short arms of the acrocentric chromosomes 13, 14, 15, 21 and 22, the genes RNR1, RNR2, RNR3, RNR4, and RNR5 respectively. These regions code for 5.8S, 18S, and 28S ribosomal RNA. The NORs are "sandwiched" between the repetitive, heterochromatic DNA sequences of the centromeres and telomeres. The exact sequence of these regions is not included in the human reference genome as of 2016 or the GRCh38.p10 released January 6, 2017. On 28 February 2019, GRCh38.p13 was released, which added the NOR sequences for the short arms of chromosomes 13, 14, 15, 21, and 22. However, it is known that NORs contain tandem copies of ribosomal DNA (rDNA) genes. Some sequences of flanking sequences proximal and distal to NORs have been reported. The NORs of a loris have been reported to be highly variable. There are also DNA sequences related to rDNA that are on other chromosomes and may be involved in nucleoli formation.

https://en.wikipedia.org/wiki/Nucleolus organizer region
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