https://courses.lumenlearning.com/wm-biology1/chapter/reading-penetrance-and-expressivity/
Prevalence rate is the total number of cases of a disease existing in a
population divided by the total population. (genotype과 무관)
Penetrance measures the proportion of a population of individuals who carry
a disease-causing allele and express the related disease phenotype. A disease
shows complete penetrance if all of the individuals who carry the related
gene are affected by the disease. (ON/OFF 비율)
Expressivity measures the extent to which a genotype shows its phenotypic
expression. Just as individuals with a certain mutation can exhibit differences
in disease severity, they can also show differences in many other aspects of
their phenotypes, such as their age of onset of disease symptoms. (발현량)
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