What mechanisms allow for new information to be added to a genome by evolutionary means?

by Sean

I am currently writing a refutation to an anti-evolutionist and one of the points I am refuting is that Darwinian evolution provides no examples/ no means of adding in new information to a genome. It can only cause different phenotypes to be expressed or different pre-existing genes to change, but not create new genetic information. If you could provide examples of the ways that evolution adds genetic information, I would greatly appreciate it. Thank you for your time.

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