The $1$ gene $1$ enzyme relationship was first established in .......... .

For protein synthesis,$P$ can directly code,while each nucleotide of $Q$ has a $2'-OH$ group in its sugar. Identify $P$ and $Q$.
$\quad\quad P\quad Q$

What is the correct chronological sequence of the following events?
$1.$ Formation of the chromosome theory of heredity
$2.$ Experiments which proved that $DNA$ is the hereditary material
$3.$ Mendel's laws of inheritance discovery
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Statement $P$: $m-RNA$ contains $75$ nucleotides.
Statement $Q$: There are $20$ types of $t-RNA$ in the cytoplasm.

The eukaryotic genome is different from the prokaryotic genome because . . . . . . .

What is central dogma and describe the packing of $DNA$ helix?