Which one of the following ratio is constant in $DNAs$ of different species
$A + T / C + G$
$A + G / T + C$
$A + C / U + G$
$A + U / C + G$
Who discovered "Reverse transcription''
The mean diameter of $DNA$ double helix is
Lampbrush chromosomes are visible
Depending upon size and centromere position, the $46$ chromosomes have been divided into a number of groups
$DNA$ multiplication is called