In vertebrate animals, spermatogenesis and oogenesis differ in that
A) oogenesis begins at the onset of sexual maturity, whereas spermatogenesis begins during embryonic development.
B) oogenesis produces four haploid cells, whereas spermatogenesis produces only one functional spermatozoon.
C) cytokinesis is unequal in oogenesis, whereas it is equal in spermatogenesis.
D) oogenesis ends at menopause, whereas spermatogenesis is finished before birth.
E) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born.
The endocrine control of spermatogenesis.
European wildcat feeding its kittens, as illustrated in Brehm's Life of Animals
This chart shows the various lines of responsibility and how they differ in presidential and parliam
Two woodcuts from Darwin’s 1872 book, The Expression of Emotions in Man and Animals, that he used ...
Sources and Actions of Vertebrate Hormones
Functional divisions of vertebrate nervous systems