What are the structures in a cell that group genes together, are composed of chromatin (dna and protein), and become visible under a light microscope during mitosis?

Chromosomes

Chromosomes are the structures in a cell that group genes together, are composed of chromatin (dna and protein), and become visible under a light microscope during mitosis.

Chromosomes are thread-like structures that are composed of protein and one molecule of DNA (chromatin) which contains an organism’s genetic information such as eye colour that are inherited from the parents. Chromosomes are visible in the cell’s nucleus under a microscope only when the cell is dividing. Each chromosome is divided into two sections by a constriction point (centromere) and most chromosomes are arranged in pairs in the nucleus of a cell. Humans possess 22 chromosome pairs (autosomes).

the answer is b

explanation: