試題詳解

36. In vertebrate animals, spermatogenesis and oogenesis differ, in that
(A) oogenesis begins at the onset of sexual maturity, whereas spermatogenesis happens in 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) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born.