Sickle-cell anaemia happens due to ...$A$... mutation in which ...$B$... of haemoglobin is affected.
Fill the correct option for $A$ and $B$
$A-$point; $B-$ $\beta$-chain
$A-$chromosomal; $B-\alpha -$chain
$A-$allele; $B-\alpha -$chain
$A-$non-allele; $B-$chain
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
If a man who is colour blind marries a women, who is pure normal for colour vision, the chances of their sons have colour blindness is
Sickle -cell anaemia has not been eliminated from the African population because it
Phenyketonuria is a genetic disorder of
$A$ - Sickle-cell anaemia is sex linked recessive trait
$R$ - This disease is controlled by more that two pair of alleles