Answer:
Here is the correct order (ascending order):
gene, DNA, chromosome, nucleus, cell, organism.
A gene is a segment of DNA that contains the instructions for building a protein or RNA molecule. DNA is the molecule that carries genetic information and makes up genes. A chromosome is a structure made of DNA and protein that carries genes. A nucleus is a membrane-bound organelle that contains chromosomes. A cell is the smallest structural and functional unit of living organisms, consisting of a nucleus (or nucleoid in prokaryotes) and cytoplasm. An organism is an individual living entity, such as a plant, animal, or bacterium, that consists of multiple cells.