If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
$0.25$
$1$
No chance
$0.5$
Which one of the following symbols and its representation, used in human pedigree analysis is correct ?
Sicklecell anaemia is
Genes for colour blindness is carried by
$I.$ Abnormal development
$II.$ Father
$III.$ Mother
$IV.$ Autosomes
Haemophilia $A$ is due to the absence of
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