https://en.wikipedia.org/wiki/Down_syndrome
It is usually associated with developmental delays, mild to moderate intellectual disability, and characteristic physical features.
https://ndss.org/about
Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21. This additional genetic material alters the course of development.
https://www.cdc.gov/birth-defects/about/down-syndrome.html
Dec 26, 2024 — Down syndrome is a condition in which a person has an extra copy of chromosome 21. Chromosomes are small "packages" of genes in the body's ...
https://www.mayoclinic.org/diseases-conditions/down-syndrome/symptoms-causes/syc-20355977
Nov 12, 2024 — Down syndrome is a genetic condition caused when an unusual cell division results in an extra full or partial copy of chromosome 21.
https://my.clevelandclinic.org/health/diseases/17818-down-syndrome
Down syndrome is a genetic condition where a person is born with an extra copy of chromosome 21. This means that they have a total of 47 chromosomes instead of ...
https://medlineplus.gov/downsyndrome.html
Jan 26, 2024 — Down syndrome is a condition in which a person has an extra chromosome or an extra piece of a chromosome. This extra copy changes how a baby's body and brain ...
https://kidshealth.org/en/parents/down-syndrome.html
Down syndrome is a condition in which a baby is born with an extra chromosome chromosome number 21. The extra chromosome is associated with delays in the child ...
https://www.nhs.uk/conditions/downs-syndrome/
Down's syndrome is when you're born with an extra chromosome. You usually get an extra chromosome by chance, because of a change in the sperm or egg before you ...
https://www.chop.edu/conditions-diseases/trisomy-21-down-syndrome
Trisomy 21, also known as Down syndrome, is the most common chromosomal anomaly in humans and can cause intellectual disabilities and health issues.
https://www.childrenshospital.org/conditions/down-syndrome
Down syndrome is a genetic condition that happens when a child is born with an extra chromosome. The extra chromosome affects the way the child's brain and ...
https://emedicine.medscape.com/article/943216-overview
Dec 6, 2024 — Down syndrome is by far the most common and best known chromosomal disorder in humans and the most common cause of intellectual disability.
https://www.childrenshospital.org/conditions/down-syndrome
Down syndrome is a genetic condition that happens when a child is born with an extra chromosome. The extra chromosome affects the way the child's brain and ...
https://www.ncbi.nlm.nih.gov/books/NBK526016/
by F Akhtar · 2023 · Cited by 105 — Down syndrome (trisomy 21) is a genetic disorder caused by the presence of all or a portion of a third chromosome 21.
https://www.marchofdimes.org/find-support/topics/planning-baby/down-syndrome
Babies with Down syndrome have an extra copy of chromosome 21, which changes how the brain and body develop.
https://www.webmd.com/children/understanding-down-syndrome-basics
Feb 23, 2024 — People with Down syndrome have an extra chromosome that impacts their looks and their ability to think, learn, and reason.
https://www.nhsinform.scot/illnesses-and-conditions/downs-syndrome/
Feb 26, 2025 — Down's syndrome is a genetic condition that typically causes some level of learning disability. Read more about the condition.
https://www.globaldownsyndrome.org/about-down-syndrome/facts-about-down-syndrome/
Down syndrome is the most frequently occurring chromosomal disorder and the leading cause of intellectual and developmental delay in the US and in the world.
https://www.downs-syndrome.org.uk/about-downs-syndrome/
Down's syndrome is when you're born with an extra chromosome. You usually get an extra chromosome by chance, because of a change in the sperm or egg before you ...
https://www.pennmedicine.org/conditions/down-syndrome
In most cases, Down syndrome occurs when there is an extra copy of chromosome 21. This form of Down syndrome is called trisomy 21.
https://www.nejm.org/doi/full/10.1056/NEJMra1706537
by MJ Bull · 2020 · Cited by 791 — Down syndrome, also called Down's syndrome (DS), is the most common chromosomal condition associated with intellectual disability.