BIO1108 QUIZ SET 1 EXAM REVIEW
QUESTIONS WITH CORRECT
ANSWERS
In some species males provide the majority of parental care and females are able to go
off and mate again. In these species we would expect the ______________ to be the
choosy sex. - Answer- males
True or false?
Sexual selection occurs because male reproductive potential is limited by the numbers
of sperm he can produce. - Answer- false
True or false?
Sexual selection occurs because females typically invest more in offspring than males. -
Answer- true
Females in some species choose among males based on _________ benefits and in
other species females choose among males based on __________ benefits. - Answer-
direct and indirect
Animal weapons are often the outcome of selection through
female mate choice.
male-male competition
natural selection.
sexual selection - Answer- male-male competition
An earthquake decimates a ground-squirrel population, killing 98% of the squirrels. The
surviving population happens to have broader stripes, on average, than the initial
population. If broadness of stripes is genetically determined, what effect has the ground-
squirrel population experienced during the earthquake?
Directional selection
, A founder event
A genetic bottleneck
Disruptive selection - Answer- a genetic bottleneck
Genetic drift is
the effect of mutations as they spread through neighbouring populations.
random changes in gene frequency in a population.
generational fluctuations in gene frequencies that produce no effect.
changes due to interbreeding with other species populations. - Answer- random
changes in gene frequency in a population
Genetic drift is most powerful in
changing environments.
stable environments.
large populations.
small populations. - Answer- small populations
True or false?
The founder effect is when a population has been established by a few individuals who
may have an unusual genetic constitution. - Answer- true
Elephant seals were common in the early 19th century but were hunted almost to
extinction. Today their numbers have increased again, but the species has little genetic
variation. We can say that this species has experienced
natural selection.
QUESTIONS WITH CORRECT
ANSWERS
In some species males provide the majority of parental care and females are able to go
off and mate again. In these species we would expect the ______________ to be the
choosy sex. - Answer- males
True or false?
Sexual selection occurs because male reproductive potential is limited by the numbers
of sperm he can produce. - Answer- false
True or false?
Sexual selection occurs because females typically invest more in offspring than males. -
Answer- true
Females in some species choose among males based on _________ benefits and in
other species females choose among males based on __________ benefits. - Answer-
direct and indirect
Animal weapons are often the outcome of selection through
female mate choice.
male-male competition
natural selection.
sexual selection - Answer- male-male competition
An earthquake decimates a ground-squirrel population, killing 98% of the squirrels. The
surviving population happens to have broader stripes, on average, than the initial
population. If broadness of stripes is genetically determined, what effect has the ground-
squirrel population experienced during the earthquake?
Directional selection
, A founder event
A genetic bottleneck
Disruptive selection - Answer- a genetic bottleneck
Genetic drift is
the effect of mutations as they spread through neighbouring populations.
random changes in gene frequency in a population.
generational fluctuations in gene frequencies that produce no effect.
changes due to interbreeding with other species populations. - Answer- random
changes in gene frequency in a population
Genetic drift is most powerful in
changing environments.
stable environments.
large populations.
small populations. - Answer- small populations
True or false?
The founder effect is when a population has been established by a few individuals who
may have an unusual genetic constitution. - Answer- true
Elephant seals were common in the early 19th century but were hunted almost to
extinction. Today their numbers have increased again, but the species has little genetic
variation. We can say that this species has experienced
natural selection.
