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NEET2007ZoologyPrinciples of Inheritance and VariationActual

XO-chromosomal abnormality in human beings causes

Options

  1. ATurner's syndrome
  2. BDown's syndrome
  3. CKlinefelter's syndrome
  4. Dnone of these.

Correct answer

A. Turner's syndrome

Step-by-step solution

Turner's syndrome is characterised by the monosomy of XO type. It is characterized by a lack of ovaries and menstrual cycle. Affected women are sterile and lack secondary sexual characteristics, although the external genitalia are present. The syndrome is named after the US endocrinologist H. H. Turner (18921970), who first described it. Down's syndrome is a congential form of mental retardation due to a chromosome defect in which there are three copies of chromosome no. 21 instead of the usual two. The affected in

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