Genesare a set of instructions that determine what the organism is like, its appearance, how it survives, and how it behaves in its environment.
Genes are present in the chromosomes of cell's nucleus.
Chromosome is a structure that is made of DNA (deoxyribonucleic acid) and proteins called histones. These structures look like threads.
Discovery of genes on chromosomes: Walter Sutton and Theodor Boveri gave the chromosomal theory of inheritance and stated that genes are present in specific locations on chromosomes.