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You have that backwards: chromosomes are made up of genes.

The above sentence is literally true of the single circular chromosome in Prokaryotes.

However in Eukaryotes it is much more complex: chromosomes are made up of genes (which are made up of exons and introns), gene control codes), at least one centromere (only one of which is functional if there is more than one), at least two telomeres (to prevent the two ends of the linear chromosome from unraveling and also believed to reduce the chance of cancers), and many sections of unknown function generally believed to be genetic "junk" that does nothing but occupy space in the chromosome.

The term "junk" DNA has now been discovered to be places where genes have been turned off or hidden.

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