.,J/ ‘

the chromosomes of human abortuses. As a result of these three
primary discoveries an eénormous literature on the cytogenetics

of man has accumulated.

ing. Biggers and McFeely (1966) reviewed the literature up to
and including 1964 and found only 47 cases of intersexuality
which had been studied by the use of cytogenetical techniques.
Most of these had only been examined in terms of sex chromatin.
The cases were distributed with respect to species as follows:
GO EE=S16 S couli= 13, pig =11, cat - 6, horse - 1 ang dog - 1.
One result of these Studies was the demonstration that the XXY
chromosome constitution occurs in cases of tortoiseshell cats.
These feline equivalents of the human Klinefelter syndrome,
however, were discovered more because of the curious association
of coat color with infertility rather than an examination of an
intersexual condition (Biggers and McFeely, 1966; Norby and
Thuline, 1965). Since 1964 many more cytogenetic studies of
intersexuality in domestic mammals have been described, and these
will be analyzed in this paper. However, as yet no studies have
been reported on the karyotypes of abortuses from domestic mam-
mals.

One reason why detailed studies on intersexuality in
domestic animals are relatively few is that people tend to feel
that once a mammal with abnormal chromosomes is born it is 1little
more than a curiosity of nature. From the economic view this is

true. Yet the Study of freemartinism in cattle by Lillie (1917)