Full text: Problems in eugenics

D. F. Weeks.Biology and Eugenics.(i 
plasm, or simplex, and half of the germ cells have and half lack the 
determiner. The method of obtaining the data was by means of 'field workers, who 
interviewed in their homes the parents, relatives and all others interested 
in the epileptic patient. These visits have established a friendly feeling 
toward and an intelligent understanding of the Institution and its work. 
The study is based on the data derived from 397 histories, covering 440 
matings. The matings are classified under the six possible types, of nulliplex x 
nulliplex, nulliplex x simplex, nulliplex x normal, simplex x simplex, 
simplex x normal, and normal x normal. 
Under the first type all those matings where both parents were epileptic, 
one was epileptic and the other feeble-minded, or both were feeble-minded, 
are classified. According to Mendel’s Law, all of the children should be 
nulliplex. The data showed all of the children defective. 
Under the type nulliplex x simplex, all matings where one parent was 
epileptic or feeble-minded and the other “ tainted,” that is, alcoholic, 
neurotic, migrainous, or showed some mental weakness, are classified. From 
this type of mating, 50% of the offspring are expected to be nulliplex and 
50% simplex. From the matings where one parent was epileptic or feeble- 
minded and the other alcoholic, there were 61% mentally deficient or 
nulliplex, the remainder simplex. The figures for the offspring from the 
other matings showed 47% nulliplex, and 53% simplex. 
For the third type, nulliplex by normal, all those matings where one 
parent was epileptic or feeble-minded and the other reported as mentally 
normal are classified. From this type of mating, the expectations are that 
all of the children would be simplex. A study of the ancestors of the 
normal parents showed these parents simplex rather than normal. The 
analysis of the offspring showed at least 43% nulliplex, which is a close 
fitting to the type of mating nulliplex x simplex. 
The fourth type of mating is simplex x simplex. Here, all matings 
where both of the parents were “ tainted ” are classified. The expectation 
is that 25% of the offspring would be nulliplex, in reality 35% were found 
to be mentally deficient. 
Simplex x normal is the fifth type of mating considered. The matings 
where one parent was tainted and the other supposedly normal, are classified 
here. From a study of their ancestors these normal parents appeared to be 
simplex, and the classification of the offspring showed more than 25% 
nulliplex, which is the expectation from simplex x simplex mating. 
The sixth type is normal x normal, and the matings where both parents 
were reported normal is studied under this heading. Here, as before, a 
study of the ancestors of these normal parents indicates that they are 
simplex, and not normal. The classification of the children showed a close 
fitting to the expectation from a simplex x simplex mating.

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