7. What about hermaphrodites self-fertilizing? This is sexual reproduction since this involves the union of eggs and sperm and these are not identical due to meiosis and crossing-over.
29. Fig. 46-12a Epididymis Seminiferous tubule Testis Cross section of seminiferous tubule Sertoli cell nucleus Primordial germ cell in embryo Mitotic divisions Spermatogonial stem cell Mitotic divisions Mitotic divisions Spermatogonium Primary spermatocyte Meiosis I Meiosis II Secondary spermatocyte Lumen of seminiferous tubule Plasma membrane Tail Neck Midpiece Head Mitochondria Nucleus Acrosome Spermatids (at two stages of differentiation) Early spermatid Differentiation (Sertoli cells provide nutrients) Sperm 2 n 2 n 2 n n n n n n n n n n n
30. Fig. 46-12f Ovary Primary oocyte within follicle Ruptured follicle Growing follicle Mature follicle Ovulated secondary oocyte Corpus luteum Degenerating corpus luteum
31. Fig. 46-12g Primordial germ cell Mitotic divisions Oogonium Mitotic divisions Primary oocyte (present at birth), arrested in prophase of meiosis I Completion of meiosis I and onset of meiosis II Secondary oocyte, arrested at metaphase of meiosis II First polar body Ovulation, sperm entry Completion of meiosis II Second polar body Fertilized egg 2 n 2 n n n n n In embryo In Embryo At fertilization At puberty
32.
33. Fig. 46-UN1 Gametogenesis Spermatogenesis Oogenesis Primary spermatocyte Primary oocyte Polar body Secondary spermatocytes Secondary oocyte Spermatids Sperm Polar body Fertilized egg n 2 n 2 n n n n n n n n n n n n n n
82. Fig. 46-18 Estradiol Oxytocin from ovaries Induces oxytocin receptors on uterus from fetus and mother’s posterior pituitary Stimulates uterus to contract Stimulates placenta to make Prostaglandins Stimulate more contractions of uterus Positive feedback + +
Notes de l'éditeur
Figure 46.1 How can each of these earthworms be both male and female?
Figure 46.5 External fertilization
Figure 46.6 Parental care in an invertebrate
Figure 46.7 Insect reproductive anatomy
Figure 46.10 Reproductive anatomy of the human female
Figure 46.11 Reproductive anatomy of the human male
Figure 46.12 Human gametogenesis
Figure 46.12 Human gametogenesis For the Cell Biology Video Motion of Isolated Flagellum, go to Animation and Video Files. For the Cell Biology Video Flagellum Movement in Swimming Sperm, go to Animation and Video Files.
Figure 46.12 Human gametogenesis
Figure 46.12 Human gametogenesis
Figure 46.13 Hormonal control of the testes
Figure 46.14 The reproductive cycle of the human female
Figure 46.14 The reproductive cycle of the human female
Figure 46.15 Formation of the zygote and early post-fertilization events