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23 February, 17:31

Which molecule is responsible for the wide diversity of life on earth?

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  1. 23 February, 19:13
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    A phylogeny is an evolutionary "tree" of related

    organisms that can be constructed by using

    information obtained from the genetic material.

    Genetic information is contained in all living cells,

    in the form of long DNA molecules that take the

    shape of connected double - stranded spirals

    (DNA stands for deoxyribonucleic acid). DNA

    spirals, or "helixes", are tightly compressed in the

    nucleus of every cell. Their information is

    organized into a code made up of four small

    molecules - the building blocks of DNA. The

    molecules, called nucleotides, are labelled:

    A (adenine), C (cytosine), G (guanine) and T

    (thymine).

    It is possible to draw conclusions about the

    evolution of a group of plant or animal species,

    and the relationships among them, by comparing

    selected pieces of DNA.
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