Geneticist plot the relative locations of genes on chromosomes by which of these methods

$A$ : Nutritional mutant strain of pink mould is auxotroph.
$R$ : It is not able to prepare its own metabolites from the raw materials obtained from outside

Synthesis of leading and lagging strand require

$c-DNA$ can be formed by

It has been found in many cells that ribosomes occur in chains along $mRNA$ molecules. What is the advantage of this arrangement as compared to a situation in which ribosomes occur singly

Assertion: An organism with lethal mutation may not even develop beyond the zygote.

Reason: All types of gene mutations are lethal.