Tizo and Levan's contribution is very significant because they
Gave the number of human chromosomes
Pointed out mutational changes
Identified Barr bodies
Detected sex linkage
If in a plant cells the ribosomes are destroyed, which of the following process will not take place
In Pisum sativum there are $14$ chromosomes. How may pairs with different chromosomal composition can be prepared
Assertion : The uptake of $DNA$ during transformation is an active, energy requiring process.
Reason : Transformation occurs in only those bacteria, which possess the enzymatic machinery involved in the active uptake and recombination
Substances known as 'heredity carriers' are
In eukaryotes, the $RNA$ polymerase that synthesises $tRNA$ is $RNA$ polymerase ______ and is also responsible for formation of ______ $rRNA$.