IB Biology - Sexual Reproduction HL

How do the levels of oxytocin and progesterone change immediately prior to birth?

• A

• B

• C

• D

Tags

NGSS.HS-LS1-3

Where is human chorionic gonadotrophin (HCG) produced?

• Ovary

• Anterior pituitary

• Embryo

• Posterior pituitary

What happens to the polar bodies formed during oogenesis?

• They cause the acrosome reaction.

• They cause the cortical reaction.

• They pull chromosomes to the ends of the cell when the zygote divides.

• They are not used and break down.

During fertilization in humans, where do the acrosome and the cortical reactions occur most often?

• A

• B

• C

• D

What happens to the zygote immediately after fertilization?

• It remains in the uterus until placenta develops.

• It implants in the wall of the uterus.

• It divides by meiosis to form an embryo.

• It divides by mitosis to form a blastocyst.

Tags

NGSS.HS-LS1-4

Which of the following are functions of the placenta?

I. Gas exchange

II. Stimulation of uterine contractions

III. Secretion of progesterone

IV. Secretion of estrogens

• I only

• III and IV only

• I, III and IV only

• I, II, III and IV

Why is human chorionic gonadotropin (HCG) important in early pregnancy?

• It is required for equal cell divisions in the growing embryo.

• It stimulates the ovary to continue production of estrogen and progesterone.

• It increases the rate of cell division in the embryo.

• It promotes growth of the inner cell mass within the embryo.

Tags

NGSS.HS-LS1-4

Which of the following occur(s) at birth in the mother’s body?

I. Increase in oxytocin

II. Increase in uterine contractions

III. Increase in levels of progesterone

• I only

• I and II only

• II and III only

• I, II and III

Which hormone maintains the corpus luteum in the ovary of a woman at implantation?

• FSH

• LH

• HCG

• Progesterone

What part of spermatogenesis in humans takes place while spermatids are associated with Sertoli cells?

• Cell differentiation

• First division of meiosis

• Second division of meiosis

• Testosterone production