Black hair and almond-shaped eyes, e.g

Usage examples of traits.

As a fact, the original traits persist with almost incredible fidelity.

If the alleged deterioration really occurs, it will still remain to be determined if the effect is permanent or an induction, that is, a change in the germ-cells which does not permanently alter the nature of the inherited traits, and which would disappear in a few generations under favorable conditions.

If one takes the simplest traits, to eliminate the most chances for confusion, one finds the same conditions every time.

For the purpose of eugenics, it is sufficient to recognize that great differences exist between men, and women, not only in respect of physical traits, but equally in respect of mental ability.

Probably no one will care to dispute the inheritance of such physical traits as eye-color.

This is not the fault of the geneticist, but rather of the psychologist, who has not yet been able to furnish the geneticist with the description of definite traits of such a character as to make possible the exhaustive analysis of their individual inheritance.

Sidis supposes, the only evidence of inheritance of mental traits which the eugenist can produce, his case would indeed be weak.

There are abundant analogies in the inheritance of other traits in man, lower animals and plants, that behave in exactly the same manner.

The likeness of various traits is determined by heredity, and brothers may be more unlike in traits which have been subjected to a large and equal amount of training.

As the psychological analysis of individual traits proceeds, it will be possible to proceed further with the study of the inheritance of these traits.

But it is possible, with present knowledge, to say that human traits, mental as well as physical, are inherited, in a high degree.

This is the coefficient for most physical and mental characters: it is the coefficient for such pathological traits as deafness and insanity, which are obviously due in most cases to inheritance rather than infection.

This selection must of course be with respect to individual traits, a man or woman being for this purpose merely the sum of his or her traits.

But actual measurement of various traits in conjugal pairs shows that mating is very rarely random.

There is a conscious or unconscious selection for certain traits, and this selection involves other traits because of the general correlation of traits in an individual.