BIOB51 EXAM QUESTIONS WITH
100% GUARANTEED PASS
What is a sensory bias? - Answer- non-mating trait preference like food color that
transfers to mating preferences
what is the role of sensory bias in sexual selection? Give examples (e.g. guppies &
swordtails) - Answer- can determine the preferences of the females which can drive
selection on males
Why do blue-footed boobies look similar and perform a mutual courtship display? -
Answer- both species have equal levels of investment
What happens when females are not the limiting sex? - Answer- variance of
reproductive success is higher in females and selection acts stronger on them
What is sex role reversal? - Answer- when males invest more in reproduction and
become choosy
How and why are dance flies and example of sex-role reversal - Answer- becuase the
male carries around a fly to share with female while mating and can only mate with one
female at a time
What is Fisherian Runaway Selection (aka Arbitrary Choice) - Answer- females choose
males because they are attractive to other females
What is the Good Genes theory of sexual selection - Answer- females choose attractive
males because these showy traits are a signal of good health
how did work on red-collared widowbirds help inform us about sexual selection -
Answer- males with more of the showy trait tend to have higher reproductive success
Why were Andersson's experiments on widowbirds so important - Answer- proved the
prediction that females prefer mates with most elaborate ornament
How has ongoing work by Sarah Pryke added to this story - Answer- proved that males
with elaborate ornaments tended to be in the best health too
What is resource allocation - Answer- tradeoff where males invest more into costly
ornaments and armaments
, how does resource allocation influence horn growth in male dung beetles - Answer-
longer horns and smaller eyes, vice versa
What is monogamy - Answer- when mates form a stable pair
What is sexual monogamy - Answer- partners mate exclusively with each other
What is social monogamy - Answer- partners may cheat on each other
What is polygamy - Answer- multiple partners
What is the polygyny? - Answer- one male, multiple females
What is sperm competition? - Answer- strategies males use to increase chances of
fertilization after coupling
How has polyandry and sperm competition led to adaptations in male
Callosobrucusmaculatus beetles - Answer- because females mate with different males,
males have toothbrush-like penis to scrub females' reproductive tract of other sperm
penis bone is called - Answer- baculum
What is the similarity of baculi from red squirrels and the aedeagus of brucid beetles -
Answer- both have spikes
What is cryptic female choice - Answer- ability of female to choose the sperm to use for
fertilization after mating
How does cryptic female choice apply to red junglefowl - Answer- they store sperm in
different pouches and use the one of the most unrelated male
What is sexual conflict - Answer- a conflict between the evolutionary interests of males
and females
What is the relationship between genital morphology, forced copulations, and sexual
conflict in ducks - Answer- females that experience forced copulations have very twisted
oviducts and males have corkscrew penis
What did Holland & Rice find about the relationship between sexual conflict and
seminalproteins in Drosophila - Answer- females evolve proteins to kill male seminal
proteins
Why is there sexual conflict in water striders - Answer- there is a lot of female
harrassment and mating is costly for females
100% GUARANTEED PASS
What is a sensory bias? - Answer- non-mating trait preference like food color that
transfers to mating preferences
what is the role of sensory bias in sexual selection? Give examples (e.g. guppies &
swordtails) - Answer- can determine the preferences of the females which can drive
selection on males
Why do blue-footed boobies look similar and perform a mutual courtship display? -
Answer- both species have equal levels of investment
What happens when females are not the limiting sex? - Answer- variance of
reproductive success is higher in females and selection acts stronger on them
What is sex role reversal? - Answer- when males invest more in reproduction and
become choosy
How and why are dance flies and example of sex-role reversal - Answer- becuase the
male carries around a fly to share with female while mating and can only mate with one
female at a time
What is Fisherian Runaway Selection (aka Arbitrary Choice) - Answer- females choose
males because they are attractive to other females
What is the Good Genes theory of sexual selection - Answer- females choose attractive
males because these showy traits are a signal of good health
how did work on red-collared widowbirds help inform us about sexual selection -
Answer- males with more of the showy trait tend to have higher reproductive success
Why were Andersson's experiments on widowbirds so important - Answer- proved the
prediction that females prefer mates with most elaborate ornament
How has ongoing work by Sarah Pryke added to this story - Answer- proved that males
with elaborate ornaments tended to be in the best health too
What is resource allocation - Answer- tradeoff where males invest more into costly
ornaments and armaments
, how does resource allocation influence horn growth in male dung beetles - Answer-
longer horns and smaller eyes, vice versa
What is monogamy - Answer- when mates form a stable pair
What is sexual monogamy - Answer- partners mate exclusively with each other
What is social monogamy - Answer- partners may cheat on each other
What is polygamy - Answer- multiple partners
What is the polygyny? - Answer- one male, multiple females
What is sperm competition? - Answer- strategies males use to increase chances of
fertilization after coupling
How has polyandry and sperm competition led to adaptations in male
Callosobrucusmaculatus beetles - Answer- because females mate with different males,
males have toothbrush-like penis to scrub females' reproductive tract of other sperm
penis bone is called - Answer- baculum
What is the similarity of baculi from red squirrels and the aedeagus of brucid beetles -
Answer- both have spikes
What is cryptic female choice - Answer- ability of female to choose the sperm to use for
fertilization after mating
How does cryptic female choice apply to red junglefowl - Answer- they store sperm in
different pouches and use the one of the most unrelated male
What is sexual conflict - Answer- a conflict between the evolutionary interests of males
and females
What is the relationship between genital morphology, forced copulations, and sexual
conflict in ducks - Answer- females that experience forced copulations have very twisted
oviducts and males have corkscrew penis
What did Holland & Rice find about the relationship between sexual conflict and
seminalproteins in Drosophila - Answer- females evolve proteins to kill male seminal
proteins
Why is there sexual conflict in water striders - Answer- there is a lot of female
harrassment and mating is costly for females
