Down"s syndrome - definition. What is Down"s syndrome
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  1. القواميس
  2. قاموس انجليزي
  3. Down"s syndrome

%ما هو (من)٪ 1 - تعريف

Genetic origins of down syndrome; Genetic origins of Down syndrome; Genetic of Down syndrome
  • Chromosome 21 from Human Genome Program

Down's syndrome         
  • A boy with Down syndrome using a cordless drill to assemble a book case
  • [[Brushfield spots]], visible in the irises of a baby with Down syndrome
  • [[Karyotype]] for Down syndrome (trisomy 21) showing the three copies of [[chromosome 21]]
  • doi-access=free}}</ref>
  • 9–16}}{{refend}}
  • Feet of a boy with Down syndrome, showing the deviated first toes
  • quote = We have identified a 16th-century Flemish Nativity painting in which one angelic figure appears distinctly different from other individuals in the painting with an appearance of Down syndrome.}}</ref>
  • Father with son who has Down syndrome
CHROMOSOMAL CONDITION CHARACTERIZED BY FLAT-LOOKING FACIAL FEATURES AND WEAK MUSCLE TONE (HYPOTONIA) IN INFANCY AND IS CAUSED BY TRISOMY OF ALL OR A CRITICAL PORTION OF CHROMOSOME 21 AND IS ASSOCIATED WITH INTELLECTUAL DISABILITY
Trisomy 21; Down's syndrome; Down's Syndrome; Downs syndrome; Down Syndrome; Downs Syndrome; Síndrome de Down; Down’s Syndrome; Down-syndrome; 47,XY,+21; 47,XX,+21; History of Down syndrome; Health aspects of Down syndrome; Trisomy-21; Down's; Trisomy 21 syndrome; History of down syndrome; Sindrome de Down; Downsyndrome; Mosaic Down Syndrome; Downs' Syndrome; Downs' syndrome; DS (genetic disorder); Downes syndrome; Downes' syndrome; Downe's syndrome; Downes's syndrome; Downs's syndrome; Downe Sydrome; Mongolianism; Trisectomy 21; 21 trisomy syndrome
Note: in AM, usually use 'Down syndrome'
Down's syndrome is a disorder that some people are born with. People who have Down's syndrome have a flat forehead and sloping eyes and lower than average intelligence.
N-UNCOUNT
Down's syndrome         
  • A boy with Down syndrome using a cordless drill to assemble a book case
  • [[Brushfield spots]], visible in the irises of a baby with Down syndrome
  • [[Karyotype]] for Down syndrome (trisomy 21) showing the three copies of [[chromosome 21]]
  • doi-access=free}}</ref>
  • 9–16}}{{refend}}
  • Feet of a boy with Down syndrome, showing the deviated first toes
  • quote = We have identified a 16th-century Flemish Nativity painting in which one angelic figure appears distinctly different from other individuals in the painting with an appearance of Down syndrome.}}</ref>
  • Father with son who has Down syndrome
CHROMOSOMAL CONDITION CHARACTERIZED BY FLAT-LOOKING FACIAL FEATURES AND WEAK MUSCLE TONE (HYPOTONIA) IN INFANCY AND IS CAUSED BY TRISOMY OF ALL OR A CRITICAL PORTION OF CHROMOSOME 21 AND IS ASSOCIATED WITH INTELLECTUAL DISABILITY
Trisomy 21; Down's syndrome; Down's Syndrome; Downs syndrome; Down Syndrome; Downs Syndrome; Síndrome de Down; Down’s Syndrome; Down-syndrome; 47,XY,+21; 47,XX,+21; History of Down syndrome; Health aspects of Down syndrome; Trisomy-21; Down's; Trisomy 21 syndrome; History of down syndrome; Sindrome de Down; Downsyndrome; Mosaic Down Syndrome; Downs' Syndrome; Downs' syndrome; DS (genetic disorder); Downes syndrome; Downes' syndrome; Downe's syndrome; Downes's syndrome; Downs's syndrome; Downe Sydrome; Mongolianism; Trisectomy 21; 21 trisomy syndrome
¦ noun Medicine a congenital disorder causing intellectual impairment and physical abnormalities including short stature and a broad facial profile.
Origin
1960s: named after the 19th-cent. English physician John L. H. Down.
Usage
Of relatively recent coinage, Down's syndrome is the accepted term in modern use, and former terms such as mongol and mongolism, which are likely to cause offence, should be avoided.
trisomy-21         
  • A boy with Down syndrome using a cordless drill to assemble a book case
  • [[Brushfield spots]], visible in the irises of a baby with Down syndrome
  • [[Karyotype]] for Down syndrome (trisomy 21) showing the three copies of [[chromosome 21]]
  • doi-access=free}}</ref>
  • 9–16}}{{refend}}
  • Feet of a boy with Down syndrome, showing the deviated first toes
  • quote = We have identified a 16th-century Flemish Nativity painting in which one angelic figure appears distinctly different from other individuals in the painting with an appearance of Down syndrome.}}</ref>
  • Father with son who has Down syndrome
CHROMOSOMAL CONDITION CHARACTERIZED BY FLAT-LOOKING FACIAL FEATURES AND WEAK MUSCLE TONE (HYPOTONIA) IN INFANCY AND IS CAUSED BY TRISOMY OF ALL OR A CRITICAL PORTION OF CHROMOSOME 21 AND IS ASSOCIATED WITH INTELLECTUAL DISABILITY
Trisomy 21; Down's syndrome; Down's Syndrome; Downs syndrome; Down Syndrome; Downs Syndrome; Síndrome de Down; Down’s Syndrome; Down-syndrome; 47,XY,+21; 47,XX,+21; History of Down syndrome; Health aspects of Down syndrome; Trisomy-21; Down's; Trisomy 21 syndrome; History of down syndrome; Sindrome de Down; Downsyndrome; Mosaic Down Syndrome; Downs' Syndrome; Downs' syndrome; DS (genetic disorder); Downes syndrome; Downes' syndrome; Downe's syndrome; Downes's syndrome; Downs's syndrome; Downe Sydrome; Mongolianism; Trisectomy 21; 21 trisomy syndrome
¦ noun Medicine the most common form of Down's syndrome, caused by an extra copy of chromosome number 21.

ويكيبيديا

Genetics of Down syndrome

Down syndrome is a chromosomal abnormality characterized by the presence of an extra copy of genetic material on chromosome 21, either in whole (trisomy 21) or part (such as due to translocations). The effects of the extra copy varies greatly from individual to individual, depending on the extent of the extra copy, genetic background, environmental factors, and random chance. Down syndrome can occur in all human populations, and analogous effects have been found in other species, such as chimpanzees and mice. In 2005, researchers have been able to create transgenic mice with most of human chromosome 21 (in addition to their normal chromosomes).

A typical human karyotype is shown here. Every chromosome has two copies. In the bottom right, there are chromosomal differences between males (XY) and females (XX), which do not concern us. A typical human karyotype is designated as 46,XX or 46,XY, indicating 46 chromosomes with an XX arrangement for females and 46 chromosomes with an XY arrangement for males. For this article, we will use females for the karyotype designation (46,XX).

https://en.wikipedia.org/wiki/Genetics of Down syndrome
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