Full text: Problems in eugenics

66Exhibit K 4—5. 
For the facts of the segregation of European and Indian 
eye-colour, I am indebted to two friends who resided for many 
years in different parts of Canada, and who do net desire their 
names published. 
The first case of this kind (Pedigree Chart, No. K 5) of segrega- 
tion of racial eye-colour is that of the offspring from a marriage between 
a blue-eyed Scotchman and a black-eyed, full blood American Red 
Indian woman.f They had a son and a daughter, and the eyes of both 
were Indian brown. This brown differs from that of European eyes, and 
can usually be distinguished by observers who know the two races 
well. The half-breed son (No. 2, Generation B) married a full blood 
Indian woman (No. 1), who also had Indian brown eyes, and by her 
had four children. Two of them were babies at the time my in­ 
formant knew them, and we may leave them out of account. The 
other two, a son and daughter (Nos. 2 and 1, Generation C), had 
Indian brown eyes. This result is in accord with Mendelian 
expectations. The half-breed Indian daughter (No. 4, Generation B) of the 
blue-eyed Scotchman and Indian mother married a Welshman (No. 5, 
B) with hazel eyes. They had seven children. Of these, two—a son 
and daughter (No. 7 and 11, Generation C)—had blue eyes. The 
remaining children—with the exception of a baby, whom my in­ 
formant had seldom seen—had eyes of varying shades of brown. 
Two (Nos. 9 and 12, C) had European brown, one dark Indian 
brown, and one Indian brown eyes (Nos. 8 and 10, C). 
The. reappearance of blue eyes among two of the Scotchman’s 
grandchildren is a clear example of the Mendelian segregation among 
the gametes of the half-breed Indian mother of the factors which 
produce blue eyes. The Welsh father, with the hazel eyes, must, 
of course, as we deduce from other cases, have carried the blue-eye 
factors recessive. 
The black-eyed full blood Indian grandmother also carried 
various shades of Indian brown, recessive to the Indian black which 
she herself manifested, since her daughter and two granddaughters 
exhibited Indian brown and dark Indian brown coloured eyes. The 
two European brown-eyed grandsons were probably in eye-colour 
hybrids between the hazel colour of the Welsh father and the Indian 
brown of the half-breed Indian mother. 
+ This is the same family as Family 5 described in connection with 
Segregation of Nose Form in exhibit K 2a.

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