Genetic information is organized into a chromosome. A chromosome is a tightly
bundled thread of genetic information stored in the nucleus of a cell. The genetic
information is organized in the form of genes attached to a protein core. (More
on genes later.)
Most organisms have several chromosomes. There are two types of chromosomes:
autosomes and sex-linked chromosomes. There are two types of chromosomes because
some genetic information is linked to the sex of the organism. Sex-linked traits,
like color blindness and gender, are stored in sex-linked chromosomes. All other
genetic information is stored in autosomes.
Each species has its own number of chromosomes. Humans have 46 chromosomes.
Next, find out how a chromosome is arranged into packets of genetic information.
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