The correct order from largest to smallest is:
Chromosome, DNA, Gene
Here's a brief explanation of each:
- Chromosome: A structure within cells that contains DNA and associated proteins; it carries genetic information.
- DNA: The molecule that contains the genetic information; it is made up of sequences of nucleotides.
- Gene: A segment of DNA that contains the instructions to make a specific protein or set of proteins; it is a functional unit of heredity.
So, the correct order is Chromosome, DNA, Gene.