Explain the term trophoblast.

Match each developmental stage with its description.

What chromosomal abnormality can result from dispermy?

Compare spermatogenesis and oogenesis as to timing of the processes, and the number and type of cells finally produced.

Cell differentiation occurs through _______________, whereas morphogenesis involves _______________. (a) pattern formation; cell determination (b) cell division; cell expansion (c) cell expansion; pattern formation (d) cell determination; cell division (e) cell determination; pattern formation

Figure 43.15 Which of the following statements about hormone regulation of the female reproductive cycle is false? LH and FSH are produced in the pituitary, and estradiol and progesterone are produced in the ovaries. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. Both progesterone and estradiol are produced by the follicles. Secretion of GnRH by the hypothalamus is inhibited by low levels of estradiol but stimulated by high levels of estradiol.

Describe the transit of breast milk from lactocytes to nipple pores.

Cell specializations are usually a modification or elaboration of one of the basic cell functions. (True or fa1se?)

Name the four main stages of mitosis, and describe what happens in each stage.

The olfactory pits form from which of the following? mesoderm cartilage ectoderm endoderm