from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The condition of being inheritable
- n. The ratio of the genetic variance of a population to its phenotypic variance; i.e. the proportion of variability that is genetic in origin
from the GNU version of the Collaborative International Dictionary of English
- n. The state of being heritable.
from The Century Dictionary and Cyclopedia
- n. The state or quality of being heritable.
Sorry, no etymologies found.
My point was limited to correcting a misstatment of the meaning of the term heritability, nothing more.
Others, such as David Goldstein of Duke University, think that heritability is hiding in rare genetic variants, not common ones — in "private mutations," genetic peculiarities that are shared by just a few people each.
According to Gould (author of The Mismeasure of Man), the idea of heritability is confused by many: "If all environments were to become equal for everyone, heritability would rise to 100% because all remaining differences in IQ would necessarily be genetic in origin."
In addition, when researching traits like IQ within even narrow populations one must take into consideration both genetic and environmental factors like nutrition, polution, etc … Therefore, heritability is almost never 100%.
Iâm afraid your understanding of heritability is deficient.
What I said (here and eslewhere, a couple of times) was that heritability is a number valid only for a specific environment, and when you change the environment, the heritability may well change (in fact, if you put all samples in an absolutely uniform environment, you find that heritability is 100% or NAN for all traits studied).
Conversely, heritability also depends on the genetic variation: If you start with a homogenous genetic sample, you find that heritability is essentially 0% for all traits.
If heritability is less than 100 percent, then the characteristic being studied is by definition "multifactorial."
Also, I understand that heritability is not necessarily the same thing as “genetic,” but I wonder why Leiter would phrase his response that way, as if it’s possible/likely that IQ is * all* heritable, but not genetic.
There is little philosophical work that critically takes on the notion of heritability in its evolutionary context.
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