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NEET2009ZoologyPrinciples of Inheritance and VariationActual

The trisomy for 21^ st chromosome is called

Options

  1. ADown's syndrome
  2. BTurner's syndrome
  3. CTurner's syndrome
  4. DKlinefelter's syndrome

Correct answer

A. Down's syndrome

Step-by-step solution

array |l|l|l| Abnormality & Cause & Characteristic array l Down's syndrome array & array l Trisomy of 21st autosome (45 A + XX/XY) array & array l Mental retardation, prominent head, flattened nasal bridge, habitually open mouth and projecting lower lips array array l Turner's syndrome array & array l Non-disjunction of sex chromosome 2 n=45 44 ~A + XO array & array l Sterile female, webbed neck, no breast development, no menstruation or egg production array array l Klinefelter's syndrome array & array l Non-disjun

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