Figure 46.0 Frogs mating

Figure 46.0x1 Utethesia ornatrix mating

Figure 46.0x2 Red beetles mating

Figure 46.1 Two from one: asexual reproduction of a sea anemone (Anthopleura elegantissima)

Figure 46.x1 Aphid giving live birth

Figure 46.2 Sexual behavior in parthenogenetic lizards

(a)

Figure 46.3 Sex reversal in a sequential hermaphrodite

Figure 46.4 The release of eggs and external fertilization

Figure 46.x2 Sea urchin sperm fertilizing an egg

Figure 46.5 Parental care in an invertebrate

Figure 46.6 Reproductive anatomy of a parasitic flatworm

Figure 46.7 Insect reproductive anatomy

Figure 46.8 Reproductive anatomy of the human male

Figure 46.8 Reproductive anatomy of the human male (continued)

Figure 46.9 Reproductive anatomy of the human female

Figure 46.9 Reproductive anatomy of the human female (continued)

Figure 46.9x Ovary (left) and follicle (right)

Figure 46.10 Ovulation

Figure 46.11 Spermatogenesis

Figure 46.11x Spermatogenesis: Seminiferous tubules (left), sperm in semen (right)

Figure 46.12 Structure of a human sperm cell

Figure 46.13a Oogenesis

Figure 46.13b Oogenesis

Figure 46.14 Hormonal control of the testes

Figure 46.15 The reproductive cycle of the human female

Figure 46.9x Ovary (left) and follicle (right)

Figure 46.13b Oogenesis

Figure 46.16 Formation of the zygote and early postfertilization events

Figure 46.17 Placental circulation

Figure 46.18 Human fetal development

Figure 46.19 Hormonal induction of labor

Figure 46.20 The three stages of labor

Figure 46.21 Mechanisms of some contraceptive methods

Figure 46.22 Ultrasound imaging