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Genes, Chromosomes And DNA

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Science


 

Genes, Chromosomes And DNA


In the majority of cells we have a nucleus, within this nucleus we have

chromosomes are contain our DNA In humans we have 23 pairs of

chromosomes, one chromosome from each parent. And these chromosomes

contain the genetic information on the DNA

 

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The DNA double helix is coiled up to form the arms of the chromosome. A gene

is small part of a chromosome, and therefore a small amount of DNA.

 

There can be different versions of the same gene, these are called alleles.

For example for the eye colour gene you can have two different versions,

consisting of two different colours.

 

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