Pick out the correct statements.
$I.$ Haemophilia is a sex-linked recessive disease
$II.$ Down's syndrome is due to aneuploidy
$III.$ Phenylketonuria is an autosomal dominant gene disorder
$IV.$ Phenylketonuria is an autosomal recessive gene disorder
$V.$ Sickle cell anaemia is an $X$-linked recessive gene disorder
$I, III$ and $V$ are correct
$I$ and $III$ are correct
$II$ and $V$ are correct
$I, II$ and $IV$ are correct
If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
Study the pedigree chart given below. What does it show?
In which of the following colourblindness is inherited
If a character is always transmitted directly from a father to all his sons and from their sons to all their sons, then which chromosome carries the gene for the character
Given below is a highly simplified representation of the human sex chromosomes from a karyotype.
The genes $a$ and $b$ could be of