Chromosomy 21 Research Paper

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Recommended: Case study in trisomy 21

Trisomy 21 is a chromosomal disorder. “It is caused by an extra chromosome 21.” (http://www.geneticcounselling.eu) This is due to nondisjunction. During meiosis a complication occurs which results in an extra chromosome. An offspring does not inherit Trisomy 21 (Down Syndrome), but other forms of the disorder can be passed along from a parent to a child. Symptoms include: Poor muscle tone- muscles are loose, typically not as strong, Smaller features- head, ears, and mouth are smaller, The face and nose are flat, Brushfield spots- colored part of the eye has noticeable white spots, Neck is shorter, Hands are noticeably different- hands are wide and short with short fingers, Eyes slant upward, Crease along the palm of the hand- deep, single crease

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