Introducing Genetics: A Graphic Guide (Introducing...) by Steve Jones

Author:Steve Jones [Jones, Steve]
Language: eng
Format: epub
ISBN: 9781848317819
Publisher: Icon Books Ltd
Published: 2014-06-05T05:00:00+00:00

Only part — sometimes a very small part — of the DNA in any gene in higher animals actually coded for a protein. Sometimes a gene was split into dozens of these exons by a series of introns, the Chinese characters.

Blimey! Most of the DNA within this gene seems to do nothing! But things soon got even worse.

Not only were human genes filled with sections that made no sense even though they were read off into the first part of the machinery but, in addition, there were huge regions — millions of DNA bases long — in between the genes that seemed to code for nothing. They made no messenger RNA at all.

In animals and plants, unlike bacteria, most of the DNA was just a few oases of sense in a desert of nonsense. The genetic message of toads and salamanders, in particular, was largely gibberish; but even humans seemed to contain quite a lot of meaningless DNA.

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