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NEET2006ZoologyPrinciples of Inheritance and VariationActual

Given below is a highly simplified representation of the human sex chromosomes from a karyotype. The gene a and b could be of

Options

  1. Acolour blindness and body height
  2. Battached ear lobe and Rhesus blood group
  3. Chaemophilia and red-green colour blindness
  4. Dphenylketonuria and haemophilia.

Correct answer

C. haemophilia and red-green colour blindness

Step-by-step solution

The figure shows, human sex chromosome with genes ' a ' and ' b '. So, ' a ' and ' b ' are sexlinked genes, that are inherited through sex chromosomes. The most important character of sex linked inheritance are colourblindness and haemophilia. Both the disorders are due to recessive sex linked genes. The gene for red green colour blindness is located on X chromosomes. The person suffering from this disease is unable to distinguish red and green colours. Haemophilia, also called bleeder's disease, is due to presence

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