An allele that appears to "skip generations" is most likely

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When an allele appears to "skip generations," it is often because it is recessive and both parents must be carriers for it to be expressed in their offspring. If a dominant allele was responsible for the pattern of inheritance, it would always be expressed in each generation. Sex-linked and autosomal inheritance patterns do not necessarily impact whether an allele skips generations.

An Allele That Appears to "Skip Generations" Is Most Likely