Supercoiled $DNA$ can be traced in
Prokaryotes and eukaryotes
Eukaryotes only
Prokaryotes only
None of these
In humans chromosomal condition of male is
The formation of multivalents at meiosis in diploid organism is due to
Chromosomes of all races of human are
The polytene chromosomes were discovered for the first time in
Catalytic property of $RNA$ was discovered by