Question

why DNA acts as better genetic material

Answer 1

DNA double helix is more stable than an RNA double helix as unlike RNA it lacks a reactive -OH at C2. DNA contains Thymine, which is basically methylated Uracil. This adds to the stability as the Uracil group in the RNA is way more reactive.

Answer 2

the 1950s, Alfred Hershey and Martha Chase did experiments with viruses and bacteria. Viruses are not made of cells. They are basically DNAinside a protein coat. To reproduce, a virus must insert its own genetic material into a cell (such as a bacterium).
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