There are 4 nitrogenous bases in DNA. Adenine pairs with thymine, and Guanine pairs with cytosine. A Dna Nucleotide consists of a 5 carbon sugar, a phosphate group and a nitrogenous base. These bases are paired up by weak hydrogen bonds, so when they have have to replicate, the enzyme helicase can easily unzip the Dna. <span />
<span>I think you're looking for August Weismann who disproved the idea of inheritance of acquired traits from somatic cells (body cells). By doing so, he proved that inheritance only takes place by germ cells (gametes). </span>
