Knowing that albinism is determined by a recessive gene in man; presence of albinism in children born to a couple proves that

  • [AIIMS 1992]
  • A

    Both the father and the mother are heterozygous for albinism

  • B

    The father is homozygous normal but the mother is heterozygous or vice versa

  • C

    The father is homozygous for albinism but the mother is heterozygous or vice versa

  • D

    $(a)$ and $(c)$ are correct

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Mongolism syndrome is caused by

If the genotype of an individual consists of only one type of genes at same locus. It is called

When a cluster of genes shows linkage behaviour they

  • [AIPMT 2003]

When whole blood is stored with an anticoagulant at $4^\circ C$, the ${K^ + }$ ions move out from the $RBC$ into the plasma. The most likely reasons for this is that

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The reduction of one pair of chromosome in human is due to