Repeat instability probably involves the formation of unusual DNA structures during DNA replication, repair and recombination. Unlike ____ mutations, which are retained in somatic tissues and stably transmitted to offspring, the repeat mutation process is ____, with products that continue to mutate within tissues and across generations.

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1. Repeat instability probably involves the formation of unusual DNA structures during DNA replication, repair and recombination. Unlike ____ mutations, which are retained in somatic tissues and stably transmitted to offspring, the repeat mutation process is ____, with products that continue to mutate within tissues and across generations.