Over de erfelijkheid van de oogkleur

Summary

• 1. I find in my material, in accordance with many other investigators, more females than males with the non-blue eye colour.

• 2 I meet in my material with no case, where both parents have blue eyes and where there are among the children with non-blue eyes. (Hurst, Davenport, Waardenburg).

  There are in my material families, where with one of the parents or with both parents the yellow colour is only slightly developed, whereas there are then among the children with more and also orange colour in the central part of the iris. The case ofBryn and ofWinge also regard families, where the colour of the brown-eyed children is situated round the pupil. Therefore, I think, we must not accept as yet, that genotypically blue-eyed parents, can have non-blue-eyed children.

• 3 The results of the cross blue x non-blue and the reciprocal cross non-blue x blue may decided if the appearance of more brown-eyed females than males, rests on some process of selection (greater fertility of brown-eyed mothers, greater mortality of blue-eyed females with some diseases) or on the heredity of the eye-colour. When the results of these crosses differ, then there is sex-linked or sex-limited heredity. The results ofWinge do not agree with those ofDe Candolle and of myself.

  It is of importance, that more material of the eye-colour is gathered, where there is taken notice of very small quantities of yellow and brown colour.