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Down syndrome (trisomy 21)
Educational only: videos on MedicalVideos.com are for general information and are not medical advice. Always consult your own doctor about your health.
The term trisomy is used to describe the presence of three chromosomes, rather than the usual matched pair of chromosomes. For example, if a baby is born with three #21 chromosomes, rather than the usual pair, then the baby would be said to have "trisomy 21." Trisomy 21 is also known as Down syndrome. Other examples of trisomy include syndromes like trisomy 18 and trisomy 13. Again, trisomy 18 or trisomy 13 simply means the child has three copies of the #18 chromosome (or of the #13 chromosome) present in each cell of the body, rather than the usual pair.
This video in 30 seconds
This video explains Down syndrome, also known as trisomy 21. It describes trisomy as having three copies of a chromosome instead of the usual pair, using chromosome 21 as the example, and mentions trisomy 18 and trisomy 13 as other examples.
Key points
- Trisomy means three copies of a chromosome are present instead of the usual pair
- Three copies of chromosome 21 cause trisomy 21, known as Down syndrome
- Trisomy 18 and trisomy 13 are given as other examples of trisomy
Video Overview
This video presents “Down syndrome (trisomy 21)” — The term trisomy is used to describe the presence of three chromosomes, rather than the usual matched pair of chromosomes. For example, if a baby is born with three #21 chromosomes, rather than the usual pair, then the baby would be said. Whether you are preparing for a procedure, studying the technique, or learning how a condition is assessed, the recording shows the process as it is performed in practice.
From our Pediatrics collection: Pediatric videos: child health, newborn care, common childhood illnesses and pediatric procedures explained for parents, students and clinicians. Browse all Pediatrics videos →
Educational content only — not a substitute for professional medical advice.
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