Chapter 46 HW

True or false? Humans form gametes by a process called gametogenesis.

What role do germ cells play in gametogenesis? A.) They produce gametes. B.)They produce cells that divide by mitosis and then undergo meiosis to form gametes. C.) They produce cells that divide by mitosis to form gametes. D.)They produce cells that undergo meiosis and develop into gametes.

What products are formed when a diploid cell undergoes meiosis? A.)Four haploid cells. B.)Two haploid cells. C.)Two diploid cells. D.)Four diploid cells.

Which of the following statements about oogenesis in humans is true? A.)Oogenesis takes place within the oviduct. B.)Beginning at puberty, a primary oocyte completes its first meiotic division to form a secondary oocyte and a polar body approximately every month. C.)The ooctye released from the ovary during ovulation is fully mature. D.)Oogonia can reproduce mitotically within an adult female ovary to produce more oogonia, which differentiate into primary oocytes.

Which diploid cells are produced by an embryonic germ cell? A.)Polar body. B.)Ovum. C.) Spermatogonia. D.) Spermatid.

True or false? The production of sperm begins at puberty when spermatogonia undergo meiosis I to form primary spermatocytes, which then undergo meiosis II to form secondary spermatocytes. These secondary spermatocytes go on to form spermatids, which mature into sperm cells.

How does spermatogenesis differ from oogenesis? A.)Production of the cells that will mature into gametes is complete by birth in spermatogenesis. B.)Gamete maturation occurs after fertilization in spermatogenesis. C.)Gametes are produced by meiosis in spermatogenesis. D.)Diploid cells give rise to four functional gametes in spermatogenesis.

Suppose you wanted to get started in the animal-breeding business. You could start out with only one of most of the following animals, but you would have to start with at least two _____. A.)sea anemones B.)sea stars C.)frogs D.)whiptail lizards E.)tapeworms

Which of the following is a form of sexual reproduction? A.)budding B.)fragmentation C.)fission D.)regeneration E.)hermaphroditism

Some salamander and insect populations consist of only genetically identical females. This occurs because _____. A.)males are killed at birth by their mothers B.)a sex-linked, dominant, lethal mutation is fixed in the population C.)a mutation in the population has eliminated the salamander equivalent of the Y chromosome D.)sperm do not fuse with eggs during reproduction, but the eggs develop into embryos anyway E.)of none of the above

External fertilization occurs mostly in _____. A.)aquatic animals B.)insects C.)animals that reproduce asexually D.)land animals E.)mammals

Vertebrates became truly terrestrial with the development of the amniotic egg. The most primitive vertebrates to possess such eggs are the _____. A.)mammals B.)bony fish C.)amphibians D.)birds E.)reptiles

Which of the following is not found in or on a healthy human ovary? A.)egg cell B.)follicle C.)endometrium D.)corpus luteum E.)progesterone

Which of the following correctly traces the path of sperm from their site of production to their exit from a man's body? A.)seminiferous tubule ... epididymis ... vas deferens ... urethra B.)epididymis ... seminiferous tubule ... vas deferens ... urethra C.)seminiferous tubule ... vas deferens ... epididymis ... urethra D.)epididymis ... urethra ... seminiferous tubule ... vas deferens E.)vas deferens ... epididymis ... urethra ... seminiferous tubule

In humans, oogenesis in comparison to spermatogenesis is different in that _____. A.)the sequence from primary oocyte to ovum is interrupted by a relatively long resting period B.)a mature ovum has not yet completed its second meiotic division C.)the first meiotic division is not completed unless the egg is reactivated by a hormone D.)cytokinesis is unequal during the meiotic divisions E.)All of the above are correct.

A peak in _____ triggers ovulation around the _____ day of the monthly cycle. A.)estrogen ... 20th B.)FSH ... 2nd C.)LH ... 7th D.)progesterone ... 14th E.)LH ... 14th

During the first trimester _____. A.)the mother may feel movements, and fetal activity may be visible through the abdominal wall B.)the fetus grows to about 30 cm C.)the fetus grows to about 3-3.5 kg D.)an ultrasound can be performed to determine the gender of the fetus E.)the fetus is most vulnerable to exposure to drugs and radiation

During human gestation, rudiments of all organs develop A.)while the embryo is in the oviduct. B.)during the blastocyst stage. C.)in the second trimester. D.)in the first trimester. E.)in the third trimester.

Peaks of LH and FSH production occur during A.)the period just before ovulation. B.)the end of the luteal phase of the ovarian cycle. C.)the secretory phase of the menstrual cycle. D.)the menstrual flow phase of the uterine cycle. E.)the beginning of the follicular phase of the ovarian cycle.

Which of the following is a true statement? A.)Estrous cycles are not controlled by hormones. B.)The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles. C.)Ovulation occurs before the endometrium thickens in estrous cycles. D.)All mammals have menstrual cycles. E.)Estrous cycles occur more often than menstrual cycles.

A fertilized egg usually implants itself and develops in the _____. A.)uterus B.)ovary C.)oviduct D.)abdominal cavity E.)none of these

A rapid increase in the _____ level stimulates ovulation. A.)progesterone B.)estrogen C.)luteinizing hormone D.)follicle-stimulating hormone E.)human chorionic gonadotropin

After ovulation, high levels of _____ inhibit _____ secretion. A.)estrogen and progesterone ... FSH and LH B.)FSH and LH ... estrogen and progesterone C.)HCG ... estrogen and progesterone D.)estrogen ... FSH E.)androgens ... FSH and LH

Developing ovarian follicles primarily secrete _____. A.)progesterone B.)estrogens C.)luteinizing hormone D.)follicle-stimulating hormone E.)human chorionic gonadotropin

If there is fertilization, secretion of _____ by the early embryo maintains the corpus luteum. A.)progesterone B.)estrogen C.)luteinizing hormone D.)follicle-stimulating hormone E.)human chorionic gonadotropin

If there is no fertilization, degeneration of the corpus luteum results in a drop in _____, which results in the sloughing off of the uterus's endometrium. A.)FSH B.)estrogen and progesterone C.)hypothalamic secretion of releasing hormones D.)HCG E.)LH

Ovulation usually occurs on or about day _____ of a 28-day ovarian cycle. A.)1 B.)7 C.)14 D.)21 E.) 28

What is the usual site of the fertilization of an egg cell? A.)uterus B.)ovary C.)oviduct D.)abdominal cavity E.)vagina

Which characteristic of the male reproductive system is not variable among animal species that reproduce sexually? A.)Presence of genitalia. B.)Shape of genitalia. C.)Presence of a scrotum. D.)Composition of accessory fluids.

True or false? The basic functions of the human female reproductive system are to produce eggs, develop offspring, and make hormones.

Which function is not performed by the male reproductive system? A.)Production and storage of oogonia.. B.)Synthesis of accessory fluids. C.)Production and storage of sperm. D.)Transport of semen.

Which hormone spikes midway through the menstrual cycle and triggers ovulation? A.)Estradiol. B.)Progesterone. C.)Follicle-stimulating hormone (FSH). D.)Luteinizing hormone (LH).

Which male reproductive structures are responsible for the transport and delivery of sperm? A.)Vas deferens, urethra, and penis. B.)Seminal vesicles, prostate gland, and bulbourethral gland. C.)Testis and epididymis. D.)Seminal vesicles, vas deferens, and urethra.

Where does a human fetus develop? A.)Uterus. B.)Vagina. C.)Cervix D.)Ovary.

Which of the following events occurs at the onset of the luteal phase of the menstrual cycle? A.)Release of high levels of FSH. B.)Shedding of the endometrium. C.)Development of the corpus luteum. D.)Maturation of the follicle.

Which of the following is not properly paired? A.)testosterone - estradiol B.)labia majora - scrotum C.)seminiferous tubule - cervix D.)Sertoli cells - follicle cells E.)vas deferens - oviduct

Which of the following characterizes parthenogenesis? A.)Specialized groups of cells grow into new individuals. B.)An egg develops without being fertilized. C.)An individual may change its sex during its lifetime. D.)An organism is first a male and then a female. E.)Both mates have male and female reproductive organs.

In male mammals, excretory and reproductive systems share A.)the urethra. B.)the urinary duct. C.)the vas deferens. D.)the testes. E.)the prostate.

For which of the following is the number the same in spermatogenesis and oogenesis? A.)functional gametes produced by meiosis. B.)gametes produced in a given time period. C.)different cell types produced by meiosis. D.)meiotic divisions required to produce each gamete. E.)interruptions in meiotic divisions.

Which of the following statements about human reproduction is false? A.)Spermatogenesis and oogenesis require different temperatures. B.)Fertilization occurs in the oviduct. C.)Oocytes complete meiosis after fertilization. D.)Effective hormonal contraceptives are currently available only for females. E.)The earliest stages of spermatogenesis occur closest to the lumen of the seminiferous tubules.

Sperm exit a male's body via the _____. A.)ejaculatory duct B.)urethra C.)oviduct D.)ureter E.)epididymis

The secretion of androgens is regulated by a _____ feedback mechanism involving the _____ and _____. A.)positive ... hypothalamus ... pituitary gland B.)negative ... hypothalamus ... pituitary gland C.)positive ... thyroid ... pituitary gland D.)negative ... pancreas ... pituitary gland E.)negative ... seminal vesicles ... prostate gland

Which hormone(s) is(are) directly responsible for triggering the development of the secondary sex characteristics of males, such as beard growth? A.)androgens B.)thymosin C.)epinephrine D.)insulin E.)parathyroid hormone

Which pituitary secretion stimulates sperm production? A.)LH B.)ACTH C.)TSH D.)PRL E.)FSH

Which pituitary secretion stimulates the testes to secrete androgens? A.)LH B.)ACTH C.)TSH D.)PRL E.)FSH

Sperm develop in the _____. A.)prostate gland B.)bulbourethral glands C.)seminiferous tubules D.)hypothalamus E.)seminal vesicles