Chapter 12, Problem 47RQ

Why is long-term parental care not associated with having many offspring during a reproductive episode?

Should fertility clinics be required to disclose all the risks of ART to couples seeking fertility treatments? Are state and/or federal laws the best way to achieve this?

Which of the following is false? The endoderm, mesoderm, ectoderm are germ layers The trophoblast is a germ layer The inner cell mass is a source of embryonic stem cells The blastula is often a hollow ball of cells.

Which hormones influence the menstrual and ovarian cycles?

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.

Which contraceptive method is 100 percent effective at preventing pregnancy? condom oral hormonal methods sterilization abstinence

Why would paired external fertilization be preferable to group spawning?

How can genomics be used to predict disease risk and treatment options?

Figure 18.17 Which of the following statements about hormone regulation of the female reproductive cycle is false? a. LH and FSH are produced in the pituitary, and estrogen and progesterone are produced in the ovaries. b. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. c. Both progesterone and estrogen are produced by the follicles. d. Secretion of GnRH by the hypothalamus is inhibited by low levels of estrogen but stimulated by high levels of estrogen.