pe) 
BALDNESS PASSED THROUGH WOMEN (Chart 2) 
Symbols the same as in the preceding chart. 
Generation I. I 1 had a normal amount of hair. 
I 4 had a normal amount. 
I 3 is questionable. 
I 2 was very bald but at what age is unknown. 
Generation II. II 1 was not bald but amount of hair is unknown. II 2, IJ 3 and II 4 were 
all very bald but age of appearance is unknown. 
had thin hair. 
Generation III. III 1 is questionable. 
II 7 is questionable. 
a carrier, inheriting the trait from her mother who was also a carrier. 
1 never became bald and had at least a normal amount of hair. IV 2 
Generation IV. IV 
now past middle age, is a carrier but has never shown the trait herself. 
IV 4 and IV 5, have never shown any signs of baldness. 
half brother, was also very bald. 
Generation V. V 
of his father’s family. In all of these 
cases the nails were abnormal. /~ 
Charts 2, 3, 4 and 5 illustrate clearly 
the general laws of the inheritance of 
pattern baldness. Chart 2 is presented 
to show that in case a woman inherits 
the simplex condition she does not 
become bald herself, but transmits bald- 
ness, in the long run, to one-half of her 
sons and also the possibility of trans- 
mission to one-half of her daughters. 
A bald man with a simplex inheritance 
transmits in the same way. I 1 had 
a normal amount of hair, but may 
have been a carrier. I 2 was bald. 
Three out of four sons of this mating, 
350 
1 became very bald between the ages of twenty-five and thirty. 
Il 5 had anormal amount of hair. II 6 
II 2 had anormal amount of hair but was undoubtedly 
III 3 is questionable. 
Her sisters, IV 3, 
IV V5a 
(Fig. 4.) 
IV 6 was very bald. 
II 2,11 3, and II 4, were all bald, and 
the only daughter, II 5, was probably a 
carrier. Her husband, II 6, was never 
bald. The daughter of this couple, 
III 2, inherited the trait from her 
mother and transmitted it to two sons, 
IV 6 and IV 7, and, at least, one 
daughter, IV 2. She was married twice 
but as nothing is known in reference 
to the hair of either husband, and more- 
over, as a son by each marriage was 
bald, it was concluded that the trait 
was inherited through her. IV 1 was 
never bald, so could not transmit bald- 
ness. IV 2 must be a carrier, trans- 
mitting the trait to her son, V 1. 
