試題詳解

52. In vertebrate animals, spermatogenesis and oogenesis differ in that
(A) oogenesis ends at menopause, whereas spermatogenesis is finished before birth.
(B) oogenesis produces four haploid cells, whereas spermatogenesis produces only one sperm.
(C) oogenesis begins at the onset of sexual maturity, whereas spermatogenesis begns during embryonic development.
(D) cytokinesis is unequal in oogenesis, whereas it is equal in spermatogenesis.
(E) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed after ovulation.