354 The Journal of Heredity 
Inheritance in Women 
No. bald No. not bald 
Matings No. matings Girls 3 ay . eee 
Expectation | Actual Expectation Actual 
BBXBb.... 2 5 pe 2 2D 2 
1? 
BBX<bb:z..;. 5 8 0 1 8 6 
1? 
BbXBb..... 4 9 2.25 2 6.75 7 
BbXbb. * 49 59 0 0 59 59 
bbXbb. . =) 24 54 0 0 54 54 
B indicates the presence of baldness, and b the Bienen of it. 
Many of the women are carriers, but as all could not be determined no attempt was made 
to tabulate them separately. 
The one woman of formula BB Xbb who was bald became so through poor health in addition 
to a simplex inheritance. 
I 
BALDNESS IN WOMEN (Chart 5) 
Generation I. I 1 was completely bald. 
I, 2 is questionable. 
Generation II. II 1 became bald at fifty-five. 
II 2 was partially bald. II 3andII 4 
were both completely bald. 
Generation III. III 1 was completely bald 
became so at twenty-five. III 2 had 
very thin hair. III 3 is questionable, as 
is also III 4. 
Generation IV. IV 1 has been completely 
bald ever since he was _ twenty-five. 
IV 2 is partially bald. (Fig. 9.) 
of II 2, became bald at fifty-five. Ina 
mating of this description one-half of 
the daughters would probably be bald. 
Actually, one daughter, III 1, became 
completely bald at twenty-five, III 2 
was never bald and III 3 is question- 
able. She probably became bald as 
both of her children, IV 1 and IV 2, 
were bald. IV 1 was partly so and 
IV 2 became completely bald at 
twenty-five. Considering B as the pres- 
ence of baldness and b as the absence 
of it, the mating in the first generation 
was probably BB by BB. However it 
was not tabulated because of the 
uncertainty. 
In the tabulation of the twenty-two 
families studied, the actual results 
coincide almost exactly with the ex- 
pectation, except in the column marked 
Bb by bb. The discrepancy between 
the number of sons and daughters 
exists because some families submitted 
did not consider any members but the 
men. The excess of bald men over men 
who are not bald can be accounted for 
by the fact that some of the matings were 
probably Bb by Bb or BB by bb. Women 
who are Bb cannot be distinguished 
from bb. They were all considered bb 
unless definitely known to have male 
relatives who were bald. Men BB for 
the trait are no different from those 
who are Bb. Consequently all bald 
men were recorded as Bb. 
While the study is not complete 
