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BIOS 280 Exam 2 Review; Questions and Answers Rated A+ $11.99   Add to cart

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BIOS 280 Exam 2 Review; Questions and Answers Rated A+

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  • Course
  • BIOS 280
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  • BIOS 280

BIOS 280 Exam 2 Review; Questions and Answers Rated A+

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  • September 18, 2024
  • 11
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • BIOS 280
  • BIOS 280
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BIOS 280 Exam 2 Review; Questions and Answers Rated
A+

1. What does it mean to say that a signal is reliable? Why are sexually select signals expected

to be reliable? What might ensure that sexually selected signal is reliable? Correct Ans-

Reliable signal- costly to produce


Ex. Long call for a frog might cause easier predation


Long tail of bird might cause easier predation, more energy spent flying


Opportunity cost- time spent on a signal is wasted, could be eating, migrating etc.




2. Describe runaway sexual selection. Correct Ans-Male trait preferred by females that

doesn't indicate male quality Ex. stalk-eyed flies




3. What is sensory bias and how is it related to sexual selection? Describe some experimental

evidence of sensory bias. Correct Ans-Sensory bias- viability selection on female sensory

system, female attraction for male trait that is absent (preexisting bias), mutation produces a

rudimentary male display trait (exploitation


-hypothesis to how sexual selection might have started


Ex. Wild guppies (fish)- flower drops orange fruit, fish like to eat, male fish generate orange

spots, female guppies have strong preference for orange

, BIOS 280 Exam 2 Review; Questions and Answers Rated
A+

4. Why are "normal" sex roles and sexual dimorphism reversed in some species? Correct

Ans-Sea horses- males get pregnant, male choose for females


Sexual selection stronger on females


Males attracted to larger females with fewer spots


→ reversed sexual dimorphism




5. What is a species? Provide a general definition and two more specific definitions that

attempt to specify more precisely the meaning of the general definition. Correct Ans-

Species- smallest evolutionary independent unit


Biological Species Concept- species are groups of actually or potentially interbreeding natural

populations, which are reproductively isolated from other such groups


Phylogenetic Species Concept- whatever the smallest group that we can identify on a

phylogenetic tree is a species




6. What are some of the limitations and drawbacks of the biological species concept? Of the

phylogenetic species concept? Correct Ans-Drawbacks of Biological Species Concept-

Microbe are not sexually producing, extinct organisms, hybrids, Organisms that don't

naturally overlap

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