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Down Syndrome
1. DOWN SYNDROME: A defect of the 21 st chromosome By: Jacquelene Dent
2. Down Syndrome a.k.a Trisonomy 21 Top: Normal set of Chromosomes. Bottom: Down Syndrome Chromosomes Down Syndrome, also known as Trisonomy 21, is a disorder that occurs when an extra chromosome is present on the 21 st chromosome. This takes place when, during meiosis, an egg with 22 chromosomes and a cell with 24 chromosomes are made. If the egg containing 24 chromosomes combines with a sperm containing 23 chromosomes, the new cell will have 47 chromosomes. If the extra chromosome is in the 21 st chromosome, then Down Syndrome has occurred.