Walking along a mile-long path in the woods, you notice a stand of your favorite wildflower, the cardinal flower, three differen
t times. You find each stand of cardinal flower, including many flowers in each stand, on a stream bank. What type of distribution applies to this example
Penetrance in genetics is defined as a proportion of individuals that carry a certain gene (mutation of the gene) with the expressed phenotype (trait). In the example above we wanted to know the penetrance of the PRSS1 Ala16Val mutation. Form 120 individuals, 72 of them expressed some evidence of pancreatitis (120-48). The proportion of them with the expressed trait can be calculated as 72:120=0.6 or 60%.
