Question 1

Which evolutionary mechanism best explains the presence of exaggerated traits in males, such as the large antlers in beetles or the long tail feathers in certain birds, as seen in the provided images?

Accepted Answer

Sexual selection for increased mating success

Question 2

In mammals, why is access to females considered a limiting resource for males according to evolutionary theory?

Accepted Answer

Females invest more in parenting, so males compete for mating opportunities

Question 3

Which of the following is NOT a mechanism of sperm competition observed in animals?

Accepted Answer

Egg-laying by males

Question 4

Refer to the graph showing residual contrasts in testes mass versus group size. What does the positive correlation suggest about the evolution of testes size in social species?

Accepted Answer

Larger group size leads to larger testes due to increased sperm competition

Question 5

Which equation best represents the relationship between reproductive success ($$R$$), number of offspring ($$O$$), and mating opportunities ($$M) $$for males in polygynous systems?

Accepted Answer

$$R = O 	imes M$$

Question 6

In polyandrous species, what is the primary evolutionary advantage of longer sperm, as shown in the bar graph comparing sperm length in monandrous and polyandrous species?

Accepted Answer

Longer sperm swim faster, increasing fertilization success

Question 7

Which of the following is a real-world example of male competition for mating opportunities?

Accepted Answer

Sneaky copulation by smaller males

Question 8

What is the main function of mate guarding behavior in humans, as described in the study materials?

Accepted Answer

To prevent rival males from mating with a partner

Question 9

Which of the following is a mechanism of cryptic female choice that occurs after mating?

Accepted Answer

Sperm storage

Question 10

According to the study by Firman and Simmons, what is the likely explanation for fertilization bias towards non-sibling sperm when sperm swimming performance is equal?

Accepted Answer

Egg-driven sperm selection against related sperm

Question 11

Which formula best describes the relationship between sperm quality ($$Q$$), sperm swimming speed ($$S$$), and sperm energetics ($$E) as $$improved by sexual selection?

Accepted Answer

$$Q = S 	imes E$$

Question 12

Which mating system is characterized by one male and multiple females with prolonged pair bonds and exclusive mating?

Accepted Answer

Polygyny

Question 13

What is the evolutionary significance of infanticide by males in some mammalian species?

Accepted Answer

It brings females into estrous more quickly, increasing male reproductive success

Question 14

Which of the following is a premating mechanism for inbreeding avoidance in animals?

Accepted Answer

Kin recognition

Question 15

In the context of sexual selection, what is the primary reason females optimize mate choice based on genetic quality?

Accepted Answer

To increase the fitness of their offspring

Question 16

Which of the following statements about sperm competition is correct?

Accepted Answer

Sperm competition can lead to the evolution of increased relative testes size in social species

Question 17

Which equation best represents the probability of fertilization ($$P) as a $$function of sperm swimming speed ($$S) $$and sperm length ($$L) in $$polyandrous species?

Accepted Answer

$$P = S 	imes L$$

Question 18

What is the main evolutionary consequence of female choice based on MHC genes?

Accepted Answer

Increased genetic diversity in offspring

Question 19

Which of the following is a plausible outcome of prolonged copulation as a sperm competition strategy?

Accepted Answer

Increased likelihood of fertilization by the copulating male

Question 20

Which of the following best describes the relationship between mate guarding behavior and ejaculate quality in humans, according to the study materials?

Accepted Answer

Mate guarding behavior negatively correlates with ejaculate quality

Lec 30

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