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NEET2007ZoologyPrinciples of Inheritance and VariationActual

A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by

Options

  1. ADown syndrome
  2. Btriploidy
  3. CTurner syndrome
  4. Dsuper femaleness

Correct answer

A. Down syndrome

Step-by-step solution

Down's syndrome is due to an extra chromosome, which combines to the chromosome pair 21. Down syndrome is caused due to trisomy, in which the fusion of a normal n gamete (haploid) takes place with an n+1 gamete (diploid). J. Langdon Down first described the developmental defect produced by trisomy in 1866. For this reason it is called Down's syndrome. Persons having Down's syndrome generally have a short, stocky build short hands, flattened facial features and poor muscle tone. In addition they are mentally retarde

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