PATHOLOGY

Detailed explanation-1: -Chromosomes contain proteins as well as DNA, and it was initially thought that genes were proteins. The first evidence leading to the identification of DNA as the genetic material came from studies in bacteria.

Detailed explanation-2: -Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA). Mitochondria are structures within cells that convert the energy from food into a form that cells can use.

Detailed explanation-3: -DNA is the genetic material of an organism and carries the instructions for all the characteristics that an organism inherits. Changes introduced in an animal’s genetic make-up can therefore be transmitted to the next generation.