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NEETZoologyPrinciples of Inheritance and Variation

Given below is a list of genetic disorders : (a) Haemophilia (b) Cystic fibrosis (c) Down's syndrome (d) Colour blindness (e) Turner's syndrome (f) Klinefelter's syndrome Choose the option that correctly identifies only the chromosomal disorders :

Options

  1. A(c), (e) and (f)
  2. B(a), (d), (e) and (f)
  3. C(b), (c) and (e)
  4. D(e) and (f)

Correct answer

A. (c), (e) and (f)

Step-by-step solution

Genetic disorders are broadly grouped into two categories: Mendelian disorders and Chromosomal disorders. Mendelian disorders are mainly determined by alteration or mutation in a single gene. Haemophilia, Cystic fibrosis, and Colour blindness are examples of Mendelian disorders. Chromosomal disorders are caused due to the absence or excess or abnormal arrangement of one or more chromosomes. Down's syndrome (Trisomy 21 ), Turner's syndrome ( 45 , XO ), and Klinefelter's syndrome ( 47 , XXY ) are examples of chromoso

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