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DOWN SYNDROME: A defect of the 21 st  chromosome By: Jacquelene Dent
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.
How can you tell if someone has it? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Those With Down Syndrome may Experience…. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Down Syndrome can lead to… ,[object Object]
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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.
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