Answer:
Nucleus
Chromosome
Gene
Explanation:
A simple explanation is that genes make up chromosomes, and chromosomes are located inside the nucleus. DNA is a thin, long string of codes and sequences that are basically the blueprint for making YOU. Genes are sections of DNA that are then shaped into a chromosome. Usually, 46 chromosomes are inside the nucleus. Having more or less chromosomes can lead to genetic problems.
Here's a photo to visualize. This photo is from Coolaboo.
