Which of the following sentence correctly describes the relationship between chromosomes and genes? a. organisms have many more chromosomes than they do genes. b. every chromosome is made up of many genes. c. chromosome is just another word for gene. d. genes use chromosomes to make proteins.

Humans have approximately 20 000 genes, while they have only 46 Chromosomes - so we see there are a lot more genes than chromosomes and there must be multiple genes per chromosome - B. Every chromosome is made up of many genes. 

In fact, we know quite a lot about our chromosomes, but we don't even know how many genes exactly we have!

They create genetic variations