Whether a loss-of-function mutation will be dominant or recessive (or anywhere in between) depends mainly on whether

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Whether a loss-of-function mutation is dominant or recessive depends on the level of functional product required for a normal phenotype. If 50 percent or less of the normal product is sufficient, the mutation will likely be recessive, whereas if more than 50 percent is required, it will likely be dominant.

Whether a Loss-Of-Function Mutation Will Be Dominant or Recessive (Or