Agronomy and Horticulture Department
Date of this Version
1924
Citation
Science, New Series, Vol. 59, No. 1521 (Feb. 22,1924), pp. 176-182
Abstract
It seems a conservative statement to say that studies
of the past twenty years among animal forms have
tended increasingly to link the phenomena of sex inheritance
with the behavior of chromosomes. To this
result, cytology and genetics have contributed perhaps
almost equally. The number of forms in which
one sex is known to have a morphologically different
chromosome complex from the other sex are many.
That, with respect to the chromosomes, the female of
certain forms produces gametes of a single kind,
whereas the male produces two kinds, and that in
turn an egg fertilized by one kind of sperm gives rise
to a female and with the other kind to a male, cytological
studies leave no doubt. In other forms it is
the female that produces two kinds of gametes and
the male one kind. The fact that in some animals sex
dimorphism is associated with unequal numbers of
chromosomes while in others, though the numbers are
the same, the sex chromosomes differ morphologically
in the two sexes, makes it seem not unlikely that functional
dimorphism may exist even where no morphological
differences in the chromosomes are seen.
Included in
Agricultural Science Commons, Agriculture Commons, Agronomy and Crop Sciences Commons, Botany Commons, Horticulture Commons, Other Plant Sciences Commons, Plant Biology Commons
Comments
Copyright 1924 R. A. Emerson