Variable expressivity and pleiotropy can account for a disease that produces different intensities of symptoms or different symptoms among individuals.

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Variable expressivity refers to a genetic trait or disease that can manifest in different ways. Pleiotropy refers to a single gene affecting multiple traits or aspects of an individual's physiology, leading to different symptoms or intensities of symptoms. Therefore, both variable expressivity and pleiotropy can account for the variability of symptoms seen in certain diseases.

Variable Expressivity and Pleiotropy Can Account for a Disease That