What makes up our characteristics?

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Humans have 46 chromosomes which are arranged into pairs, so 23 chromosomes from each parent. Each chromosome is made up of a single DNA molecule about 5cm long which contains about 1.3x10 8. In a human cell, the nucleus is 5 micrometers in diameter and contains about 1 meter of DNA.

It all fits in through protein molecules called histones which have the DNA wrapped and coiled round them forming chromatin which is like 'beads on a string'. Then these histone beads are…


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