True or false? Humans form gametes by a process called gametogenesis. |
True |
What role do germ cells play in gametogenesis? |
B.)They produce cells that divide by mitosis and then undergo meiosis to form gametes. |
What products are formed when a diploid cell undergoes meiosis? |
A.)Four haploid cells. |
Which of the following statements about oogenesis in humans is true? |
B.)Beginning at puberty, a primary oocyte completes its first meiotic division to form a secondary oocyte and a polar body approximately every month. |
Which diploid cells are produced by an embryonic germ cell? A.)Polar body. |
C.) Spermatogonia. |
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. |
False |
How does spermatogenesis differ from oogenesis? A.)Production of the cells that will mature into gametes is complete by birth 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 |
C.)frogs |
Which of the following is a form of sexual reproduction? A.)budding |
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 |
D.)sperm do not fuse with eggs during reproduction, but the eggs develop into embryos anyway |
External fertilization occurs mostly in _____. A.)aquatic animals |
A.)aquatic animals |
Vertebrates became truly terrestrial with the development of the amniotic egg. The most primitive vertebrates to possess such eggs are the _____. A.)mammals |
E.)reptiles |
Which of the following is not found in or on a healthy human ovary? A.)egg cell |
C.)endometrium |
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 |
A.)seminiferous tubule … epididymis … vas deferens … urethra |
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 |
E.)All of the above are correct. |
A peak in _____ triggers ovulation around the _____ day of the monthly cycle. A.)estrogen … 20th |
E.)LH … 14th |
During the first trimester _____. A.)the mother may feel movements, and fetal activity may be visible through the abdominal wall |
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. |
D.)in the first trimester. |
Peaks of LH and FSH production occur during A.)the period just before ovulation. |
A.)the period just before ovulation. |
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. |
A fertilized egg usually implants itself and develops in the _____. A.)uterus |
A.)uterus |
A rapid increase in the _____ level stimulates ovulation. A.)progesterone |
C.)luteinizing hormone |
After ovulation, high levels of _____ inhibit _____ secretion. A.)estrogen and progesterone … FSH and LH |
A.)estrogen and progesterone … FSH and LH |
Developing ovarian follicles primarily secrete _____. A.)progesterone |
B.)estrogens |
If there is fertilization, secretion of _____ by the early embryo maintains the corpus luteum. A.)progesterone |
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 |
Ovulation usually occurs on or about day _____ of a 28-day ovarian cycle. A.)1 |
C.)14 |
What is the usual site of the fertilization of an egg cell? A.)uterus |
C.)oviduct |
Which characteristic of the male reproductive system is not variable among animal species that reproduce sexually? A.)Presence of genitalia. |
A.)Presence of genitalia. |
True or false? The basic functions of the human female reproductive system are to produce eggs, develop offspring, and make hormones. |
True |
Which function is not performed by the male reproductive system? A.)Production and storage of oogonia.. |
A.)Production and storage of oogonia.. |
Which hormone spikes midway through the menstrual cycle and triggers ovulation? A.)Estradiol. |
D.)Luteinizing hormone (LH). |
Which male reproductive structures are responsible for the transport and delivery of sperm? A.)Vas deferens, urethra, and penis. |
A.)Vas deferens, urethra, and penis |
Where does a human fetus develop? A.)Uterus. |
A.)Uterus. |
Which of the following events occurs at the onset of the luteal phase of the menstrual cycle? A.)Release of high levels of FSH. |
C.)Development of the corpus luteum. |
Which of the following is not properly paired? A.)testosterone – estradiol |
C.)seminiferous tubule – cervix |
Which of the following characterizes parthenogenesis? A.)Specialized groups of cells grow into new individuals. |
B.)An egg develops without being fertilized. |
In male mammals, excretory and reproductive systems share A.)the urethra. |
A.)the urethra. |
For which of the following is the number the same in spermatogenesis and oogenesis? A.)functional gametes produced by meiosis. |
D.)meiotic divisions required to produce each gamete. |
Which of the following statements about human reproduction is false? A.)Spermatogenesis and oogenesis require different temperatures. |
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 |
The secretion of androgens is regulated by a _____ feedback mechanism involving the _____ and _____. A.)positive … hypothalamus … pituitary gland |
B.)negative … hypothalamus … pituitary 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 |
A.)androgens |
Which pituitary secretion stimulates sperm production? A.)LH |
E.)FSH |
Which pituitary secretion stimulates the testes to secrete androgens? A.)LH |
A.)LH |
Sperm develop in the _____. A.)prostate gland |
C.)seminiferous tubules |
Chapter 46 HW
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