I believe you are referring to heritability, which is the concept used in debates about nature versus nurture.For the source and more detailed information concerning this subject, click on the related links section (Answers.com) indicated below this answer box.
Heritability is a measure of the proportion of variability in a trait within a population that can be attributed to genetic differences. It ranges from 0 to 1, with 1 indicating that all variability in the trait is due to genetic differences.
heretity is another name for biolaogical inheritance
Heritability is a concept that summarizes how much of the variation in a trait is due to variation in genetic factors.