$A$ : Sickel cell anaemia occurs due to the point mutation.
$R$ : $mRNA$ produced from $Hb(s)$ gene has $GAG$ instead of $GUG$.
The amino acid substituted in sickle cell anaemia is
If mother is a carrier for colour blindness and father is normal, then in the offsprings this disease may be seen in
Describe Mendelian Disorder