Understandings:
- Spermatogenesis and oogenesis both involve mitosis, cell growth, two divisions of meiosis and differentiation.
- Processes in spermatogenesis and oogenesis result in different numbers of gametes with different amounts of cytoplasm.
- Fertilization in animals can be internal or external.
- Fertilization involves mechanisms that prevent polyspermy.
- Implantation of the blastocysts in the endometrium is essential for the continuation of pregnancy.
- HCG stimulates the ovary to secrete progesterone during early pregnancy.
- The placenta facilitates the exchange of materials between the mother and fetus.
- Estrogen and progesterone are secreted by the placenta once it has formed.
- Birth is mediated by positive feedback involving estrogen and oxytocin.
- The average 38-week pregnancy in humans can be positioned on a graph showing the correlation between animals’ size and development of the young at birth for other mammals.
- Annotation of a diagram of seminiferous tubule and ovary to show the stages of gametogenesis.
- Annotations of diagrams of mature sperm and egg to indicate functions.
- Assessing risks and benefits associated with scientific research-the risks to human male fertility were not adequately assessed before steroids related to progesterone and estrogen were released into the environment as a result of the use of female contraceptive pill.
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| reproduction_11.3.ppt |
| reproduction_6___11.ppt |
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