The most likely reason for the development of resistance against pesticides in insect damaging a crop is
Random mutations
Genetic recombination
Directed mutations
Acquired heritable changes
If in a child of $10$ years ages of the intelligence is of $14$ years child, the $I.Q.$ of this child would be
In Turner's syndrome
Mendel studied on pea plant in
A medical technician while observing a human blood smear under the microscope notes the presence of barrbody close to the nuclear membrane in the $WBC$. This indicates that person under investigation is
Loss or gain of a segment of $DNA$ results in