Physical,psychomotor,and mental development is retarded in an individual affected with

  • A
    Down's syndrome
  • B
    Sickle cell anaemia
  • C
    Turner's syndrome
  • D
    Colour blindness

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What is the cause of $Down's$ syndrome?

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Which of the following are characteristics of the disorder described by Langdon Down?

Identify the given figure and select the correct option.
$\quad\quad\quad P\quad\quad Q$

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