BIOL Chap 51

What is true of semen? Check all that apply.

It contains fructose. It assists with sperm survival and motility.

What are the advantages of internal fertilization? Check all that apply.

It provides protection from the environment and predators. The proximity of sperm and eggs is guaranteed.

A normal corpus luteum secretes large amounts of progesterone and a smaller amount of estradiol. What would result from a malfunctioning corpus luteum that failed to secrete progesterone? Check all that apply.

LH and FSH levels would rise.

After the second meiotic event, imagine you observed spermatids with 12 chromosomes. What would the primary spermatocyte have for a chromosome count?

24

Prior to the first meiotic event, you observed a spermatocyte with 12 chromosomes. What would spermatids have for a chromosome count?

6

The sperm of deer have 34 chromosomes. How many total chromosomes will a fertilized egg of the deer have?

68

There are two phases to the human menstrual cycle. Identify the events that occur during the follicular phase.

Development of fluid filled vesicles Development of the mature (tertiary) follicle

If you were to inject a substance that prevents the hypothalamus from releasing Gonadotropin-Releasing Hormone near the end of the follicular phase of an otherwise normally functioning female, what would be the most likely result?

Follicle Stimulating Hormone and Luteinizing Hormone levels would not surge normally and ovulation would not occur.

What is true of the role of hormones in the regulation of female reproductive function?

GnRH stimulates release of both LH and FSH. Progesterone inhibits LH and FSH during the luteal phase.

What role(s) does meiosis play in gametogenesis? Check all that apply.

Meiosis reduces the number of chromosomes by half. Meiosis allows equal genetic contributions from each parent.

You are studying two populations of rotifers. In Population 1, you find significantly higher genetic diversity than in Population 2. You also observe that females in Population 2 have significantly more offspring, most of which are haploid, whereas in Population 1, females have fewer diploid offspring. What is the most likely explanation of the differences between the rotifer populations?

Population 1 reproduces sexually while Population 2 reproduces by parthenogenesis.

There are two phases to the human menstrual cycle. Identify the events that occur during the luteal phase

Presence of corpus albicans Presence of the corpus lueteum Rapid growth of granulosa cells

What would you predict is the fate of the daughter spermatogonium that resulted from the first mitotic division?

The daughter spermatogonium would go through a mitotic division producing another daughter spermatogonium and a primary spermatocyte.

During the menstrual cycle the oocyte is released from the follicle. In what organ does the follicle develop, and what is the immediate destination of the oocyte?

The follicle develops in the ovary and the oocyte will travel to the fallopian tube.

What would happen to FSH levels in an otherwise normal 18 year old male if he was injected with a substance the blocked production of inhibin by Sertoli cells?

The level of FSH would rise somewhat above normal because it would be controlled by a single feedback mechanism.

Which part of the mammalian sperm contains the nucleus?

head

Which of the following has an antrum?

mature follicle

When a primary follicle enlarges, and there are several layers of granulosa cells, it is called a

secondary follicle.

Spermatogenesis occurs in the

seminiferous tubules.

Which of the following is a correct sequence of cells in spermatogenesis?

spermatogonium -> primary spermatocyte -> secondary spermatocyte

What is the function of the mitochondria in the case of the sperm?

to provide energy for movement