Topic 11.4: Sexual Reproduction
- Sexual reproduction involves the development and fusion of haploid gametes.
Nature of science:
- 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 the female contraceptive pill. (4.8)
11.4 U 1 Spermatogenesis and oogenesis both involve mitosis, cell growth, two divisions of meiosis and differentiation.
11.4 U 2 Processes in spermatogenesis and oogenesis result in different numbers of gametes with different amounts
11.4 U 3 Fertilization in animals can be internal or external.
11.4 U 4 Fertilization involves mechanisms that prevent polyspermy.
11.4 U 5 Implantation of the blastocyst in the endometrium is essential for the continuation of pregnancy.
11.4 U 6 HCG stimulates the ovary to secrete progesterone during early pregnancy.
11.4 U 7 The placenta facilitates the exchange of materials between the mother and fetus.
11.4 U 8 Estrogen and progesterone are secreted by the placenta once it has formed.
11.4 U 9 Birth is mediated by positive feedback involving estrogen and oxytocin.
11.4 A 1 The average 38-week pregnancy in humans can be positioned on a graph showing the correlation between animal size and the development of the young at birth for other mammals.
11.4 S 1 Annotation of diagrams of seminiferous tubule and ovary to show the stages of gametogenesis.
11.4 S 2 Annotation of diagrams of mature sperm and egg to indicate functions.
In The News
In The News
Alex Lee discusses Topic 11.4