Most of the hereditary information that deter- mines the traits of an organism is located in (1) only those cells of an individual produced by meiosis (2) the nuclei of body cells of an indi- vidual (3) certain genes in the vacuoles of body cells (4) the numerous ribosomes in certain cells

To determine where most of the hereditary information is located, we need to analyze the given options:

(1) Only those cells of an individual produced by meiosis: Meiosis is a type of cell division that occurs in reproductive cells, such as sperm and egg cells. While meiosis does play a role in passing on hereditary information, it is not the only location where this information is found.

(2) The nuclei of body cells of an individual: The nuclei of body cells contain the majority of an organism's genetic material. This genetic material, in the form of DNA, carries the instructions for the development and functioning of the organism.

(3) Certain genes in the vacuoles of body cells: Vacuoles are membrane-bound organelles found in cells, but they are primarily responsible for storing water, nutrients, and waste products. While genes are present in the nucleus of cells, they are not typically found in vacuoles.

(4) The numerous ribosomes in certain cells: Ribosomes are cellular structures involved in protein synthesis. While they play a crucial role in the production of proteins, they do not contain the hereditary information that determines an organism's traits.

Based on the options provided, the correct answer is (2) the nuclei of body cells of an individual. This is where most of the hereditary information, in the form of DNA, is located.