Final answer:
The genetic information for traits such as brown hair and green eyes is found in the nucleus of the cell, which contains the DNA and genes responsible for these characteristics.
Step-by-step explanation:
The genetic information that determines traits such as brown hair and green eyes is stored in the nucleus of the cell. The nucleus is essentially the control center of the cell, containing the cell's genetic material in the form of DNA. This DNA is tightly packed in structures called chromosomes, which contain the specific genes that code for various physical traits and characteristics. The nucleus is a membrane-enclosed organelle found in most eukaryotic cells. It contains the cell's genetic information, which is encoded in DNA in the form of genes. The genes in the nucleus determine the traits, such as hair and eye color, that are expressed in the boy's physical appearance.
When we look at the options provided in the question, the correct choice is A. Nucleus. Mitochondria, cytoplasm, and endoplasmic reticulum have their own specific functions within the cell, but they do not house the genetic information responsible for eye and hair color. While mitochondria contain their own DNA, it's mainly responsible for functions related to cellular energy production and not traits like hair or eye color that are inherited through the nucleus.