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invisible links from generation to generation, from family to family and from
country to country. Below, we shall give examples of this.
The table shows that there must be a propensity for a certain recessive
disease to appear in one or several of the children. If one of the parents is
effected by the disease, and the other is a healthy homozygot, all the children
will be sound, though heterozygots. If the propensity of the disease is a domi*
nant attribute, so in the last mentioned case, all the children will be affected.
On the other hånd, if both the parents are sound, although heterozygots with
propensity for a certain recessive disease, 25 % of the children will be affected
This is a very common occurrence with human beings, that is to say, an epilep*
tic or a person of weak mind, may have healthy parents or even forefathers for
several or many generations, for heterozygotism can be inherited from generation
to generation, without the disease appearing.
In such families in which the propensity of the disease of a recessive nature
is inherited, one often finds one or of few cases of the disease here and there
in different households, whereas other families or branches are free from the
same. The disease appears within households with collateral expansion, though
seldom in 2 or more successive generations. Numerous marriages between rela*
tions increase the number of such cases apparently, as persons with similar here*
ditary propensities are thus often united.
Moreover it is of great importance to remember, that not a few people,
who appear to be quite sound, are often bearers, and transmitters of serious pro*
pensities, they are, so called »conductors».
From the present scientific standpoint, we cannot unfortunately beforehand
distinguish between homozygotically and heterozygotically sound persons, which
however would be of great importance, because heterozygots often, in future ge*
nerations, generate persons affected by the disease.
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