Down's syndrome is caused by an extra copy of chromosome number $21$. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder (in $\%$)?

  • A
    $25$
  • B
    $100$
  • C
    $75$
  • D
    $50$

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Down syndrome is caused by an extra chromosome in the $21$st pair. What percentage of offspring from an affected mother and a normal father will show the effect of this disorder (in $\%$)?

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Column-$I$ (Disorder) Column-$II$ (Ploidy)
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