In man the mutation disease ‘Aniridia' $(Congenital\, absence \,of\, iris)$ occurs due to
Recessive mutation
Dominant mutation
Lethal mutation
All the above
Select incorrect one (w.r.t. reciprocal cross)
In man, four phenotypes of blood groups are due to the presence of antigen-$A$ and antigen-$B$ on the $RBC.$ The chromosome that has the gene to control these antigens is
What is the unit of crossing over
The most likely reason for the development of resistance against pesticides in insects damaging a crop is