If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

  • [NEET 2013]
  • A

    $0.25$

  • B

    $1$

  • C

    No chance

  • D

    $0.5$

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Which one of the following symbols and its representation, used in human pedigree analysis is correct ?

  • [AIPMT 2010]

Sickle­cell anaemia is

  • [AIPMT 2009]

Genes for colour blindness is carried by

$I.$ Abnormal development

$II.$ Father

$III.$ Mother

$IV.$ Autosomes

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Given below is a pedigree chart showing the inheritance of a certain sex- linked trait in humans.

The trait traced in the above pedigree chart is