Which of the following is not true of autosomal dominant inheritance?

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In autosomal dominant inheritance, one allele is abnormal for expression of the disease phenotype.The disease frequently involves multiple generations in a family and occurs with equal frequency in males and females.However, such diseases can occur in the absence of family history, suggesting the occurrence of a new mutation or variable penetrance.In autosomal recessive inheritance, an individual must inherit two copies of a mutant allele in a particular locus, one from each parent, to be affected.

Which of the Following Is Not True of Autosomal Dominant