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How can two biological sequences be anything but homologous?

Discussion in 'Biology' started by ning, Oct 8, 2018.

  1. ning

    ning Guest

    If we consider homology between two nucleotide sequences as a yes/no answer to whether they have shared a common ancestral sequence, then given that all life share common ancestry and sequences are carried by living things, then how can two biological sequences be anything but homologous?

    One possibility I can think of is perhaps natural transformation in bacterial---but even so, the DNA sequences picked up must have come from a biological source.

    (I assume that it must be possible that there are sequences that are non-homologous, because otherwise there wouldn't be a need to point out which things are homologous, i.e. I assume that the concept of sequence homology would not be as widely used as it is right now)

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