How do new alleles enter a population?

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    • #10071
      Casey
      Participant

      I was going through past exam papers and came across this question

      Explain how new alleles can enter and become established in a population.

      Is it because of mutations?

    • #85854
      alextemplet
      Participant

      That’s one way for new alleles to enter a population. Some scientists think they can also be introduced from other sources such as bacteria or viruses.

    • #85871
      Casey
      Participant

      Cool thanks! Also the process of meiosis that helps with variation, is that simply crossing over?

    • #85886
      wbla3335
      Participant

      Yes, recombination can create new alleles. Also, gene flow from other populations. So these three – new mutations, recombination, and gene flow – are the most common ways for a population to acquire new alleles. Horizontal, or lateral, transfer is also a mechanism in prokaryotes (nearly the entire genome of a species of Wolbachia has been found within the genome of Drosophila ananassae – so lots of new genes too, not just alleles).

    • #85908
      Casey
      Participant

      Cool thanks! Thats heaps to help 🙂

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