NPA personality theory
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Re: Short Parents with Tall Children
It would be too onerous to try to repeat our schema here. The best we could do is to try to explain it in the context of "Case Studies" (Chap. 6). The nature of the population in question is important, and we gave examples that would be relevant to both sanguine and non-sanguine habitancies. As one may have surmised, sometimes families having short parents and tall children are predicted to be associated with infertility (miscarriage, stillbirth and infants who fail to thrive). We neglected the A− trait, although it can certainly be important. But in general, the NPA− type can be considered to be an NPA+ type who carries an extra allele regulating partial inhibition of the A trait, whether it be at the A locus itself or at another locus ("epistasis").