Define fertilization, and explain why numerous spermatozoa are required to fertilize a secondary oocyte.

2. Identify the stage of development that results from cleavage. What developmental stage begins once the zygote arrives in the uterine cavity?

3. Describe the blastocyst and its role in implantation.

4. Describe gastrulation and the formation of the germ layers.

5. Name the four extraembryonic membranes.

6. Describe the placental hormones.

7. Explain organogenesis.

8. Identify the main event in fetal development during the second trimester and third trimester.

9. Name the three stages of labor and describe the events that characterize each stage.

10. Name the stages of postnatal development, and describe the time frame involved for each of the stages.

11. Name the three major interacting hormonal events associated with the onset of puberty.

12. Define homozygous and heterozygous.

13. Differentiate between simple inheritance and polygenic inheritance.

14. Define single nucleotide polymorphism.

15. Name the disorder characterized by each of the following chromosome patterns:
a. XO
b. XXY

16. Identify the chromosome involved in each of the following disorders:
a. Ovarian cancer
b. Tay-Sachs disease
c. Spinocerebellar ataxia