Exchange of chromosome segments between maternal and paternal chromatids during synapsis in meiosis is called
Linkage
Crossing over
Dominance
Mutation
The enzyme $DNA$ polymerase was discovered by
In a hair pin model of $RNA$ which nitrogen base is present at the short end
Assertion: An organism with lethal mutation may not even develop beyond the zygote.
Reason: All types of gene mutations are lethal.
Relative morphologies of chromosomes of an individual indicate his/her
Who was awarded Nobel Prize for synthesis of $RNA$ in $1959$