<em>The genetic instructions are found in </em><u><em>the nitrogen bases </em></u><em>within the DNA, which is contained in </em><u><em>nucleotide</em></u><em> inside the nucleus of the cells. </em>
<u>Explanation:</u>
Inside nucleotide there are nitrogen bases along with phosphate group and sugar group. The four nitrogen bases are <em>adenine, thymine, guanine and cytosine (ATGC). </em>
These four bases pair up with each other inside the nucleotide. The order in which these bases are placed determines the genetic codes. This passes the instructions and characteristics from the parents to offspring.
