The "cri-du-chat" syndrome is caused by change in chromosome structure involving

  • [AIIMS 2005]
  • A

    Deletion

  • B

    Duplication

  • C

    Inversion

  • D

    Translocation

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The reason why some mutations which are harmful do not get eliminated from the gene pool, is that

  • [AIIMS 1984]

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

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of ${F_2}$ progenies that mutation is found in

  • [AIPMT 2004]

The defect sickle-cell anaemia is caused by the ______ of glutamic acid by valine at the $6^{th}$ position of the ______ globin chain of the haemoglobin molecule.

Alleles which show independent effect are called

  • [AIPMT 1996]