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Chromosomes and genes

Chromosomes

Chromosomes are thin strands of DNA (deoxyribonucleic acid).

They are subdivided into .

In most cells, are located in functional pairs in the .

Chromosomes

Humans have 46 chromosomes arranged in 23 pairs.

In contrast, do not have pairs of chromosomes in their nuclei and bacterial cells do not have a .

The entire genetic material of an is known as the .

Genes

A gene is a short length of DNA found on a chromosome that codes for a particular characteristic or protein.

Alleles are different forms of the same gene. For example, eye colour is the gene but blue, green, brown etc. are alleles.

Alleles

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