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Updated: May 3, 2025
It is indeed an absurdity to the "pure line" Mendelian, but not to one who appreciates the fact that Mendelian units are subject to quantitative variation sometimes continuous, sometimes discontinuous. An example of the former is found in the hooded pattern of rats, of the latter in albinism and other Mendelizing characters which assume multiple allelomorphic conditions.
We now find that albinism in guinea-pigs shows an even greater range of variation, yet there can be no doubt of its fundamental unity as a Mendelian character, each grade of which is allelomorphic to every other grade and to normal pigmentation. Castle and Phillips, 1914, Publ. No. 195, Carnegie Inst. of Wash. Castle and Fish, Amer. Nat., Feb., 1915. Wright, S. Amer. Nat., March, 1915.
Each is a unit character but showing graded allelomorphic conditions which correspond probably with different stages of arrested development of pigmentation or mentality respectively. The fact noted by Goddard that the feeble-minded resemble savages, that is backward races of low mentality, has much interest to the student of evolution.
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