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Hormones and Heredity (Paperback)
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Hormones and Heredity (Paperback)
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The zygote therefore, whether the sex of it is determined as male
or female, has the same factor for the development of milk glands.
On the chromosome theory as formulated by Morgan this factor must
be in the somatic chromosomes and not in the sex-chromosomes, and
must be present in every zygote. All the cells of the body,
assuming that somatic segregation does not occur, must possess the
same chromosomes as the zygote from which it developed, and whether
the sex chromosomes are XX or XY or X, there must be at any rate
one chromosome bearing the factor for milk glands. The functional
development of these depends normally, according to the evidence
hitherto discovered, on the presence or absence of hormones from
the ovary or from the uterus.
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