Question 1

Which of the following best explains why sexual reproduction is considered an evolutionary enigma, despite its prevalence among eukaryotes?

Accepted Answer

Sexual reproduction has a twofold cost because only half of the offspring are female, yet it persists due to the genetic variation it provides.

Question 2

A population of Daphnia (water fleas) switches from asexual to sexual reproduction when environmental conditions become unfavorable. What is the most likely advantage of this switch?

Accepted Answer

Sexual reproduction increases genetic diversity, which may help the population survive changing conditions.

Question 3

Which mechanism of asexual reproduction involves the regrowth of lost body parts and the development of new individuals from body fragments?

Accepted Answer

Fragmentation with regeneration

Question 4

In which scenario would internal fertilization be most advantageous compared to external fertilization?

Accepted Answer

A terrestrial species where gametes are at risk of drying out.

Question 5

Which of the following statements about hermaphroditism is correct?

Accepted Answer

Any two hermaphroditic individuals can mate, and some can self-fertilize.

Question 6

Which hormone is secreted by the hypothalamus and stimulates the anterior pituitary to release FSH and LH?

Accepted Answer

Gonadotropin-releasing hormone (GnRH)

Question 7

A woman undergoes tubal ligation as a form of contraception. Which structure is directly affected by this procedure?

Accepted Answer

Oviduct (fallopian tube)

Question 8

Which of the following best describes the role of the corpus luteum in the ovarian cycle?

Accepted Answer

It secretes progesterone and estradiol to maintain the uterine lining.

Question 9

Which of the following is a key difference between spermatogenesis and oogenesis?

Accepted Answer

All four products of meiosis become sperm in spermatogenesis, but only one becomes an egg in oogenesis.

Question 10

A patient is found to have low levels of FSH and LH, resulting in reduced gamete production. Which gland is most likely malfunctioning?

Accepted Answer

Anterior pituitary gland

Question 11

Which of the following best explains why latex condoms are unique among contraceptive methods?

Accepted Answer

They are the only contraceptive effective in preventing the spread of sexually transmitted diseases.

Question 12

Which hormone is responsible for maintaining the uterine lining during the early stages of pregnancy?

Accepted Answer

Human chorionic gonadotropin (hCG)

Question 13

A researcher observes that a certain animal species only mates during a specific period called 'estrus.' What is a key feature of the estrous cycle in these animals?

Accepted Answer

Sexual receptivity is limited to the 'heat' period.

Question 14

Which of the following is a direct result of negative feedback by testosterone in the male reproductive system?

Accepted Answer

Decreased secretion of FSH and LH from the anterior pituitary

Question 15

A couple is undergoing in vitro fertilization (IVF). Which step is unique to IVF compared to natural conception?

Accepted Answer

Eggs and sperm are mixed in a culture dish outside the body.

Question 16

Which of the following best describes the function of the Sertoli cells in the testes?

Accepted Answer

They nourish developing sperm and secrete inhibin.

Question 17

A woman is diagnosed with endometriosis. Which of the following best describes this condition?

Accepted Answer

Cells of the uterine lining migrate to ectopic locations and swell and break down each cycle.

Question 18

Which of the following is a plausible explanation for the evolution of menopause in humans?

Accepted Answer

It enables mothers to provide better care for their children and grandchildren.

Question 19

Which of the following best describes the process of parthenogenesis?

Accepted Answer

Development of a new individual from an unfertilized egg

Question 20

Which of the following is a function of the placenta during pregnancy?

Accepted Answer

It secretes hormones and facilitates nutrient and waste exchange between mother and fetus.

Animal Reproduction: Mechanisms, Anatomy, and Regulation

Study Guide - Practice Questions

Study Guide - Flashcards