PCB 3043 Chapter 9 || with Complete Solutions.
Classify the statement about asexual and sexual reproduction as true or false:
Offspring may be produced from vegetative tissues of the parent in asexual reproduction. correct
answers True
Classify the statement about asexual and sexual reproduction as true or false:
Harmful alleles may only be inherited by some offspring during sexual reproduction. correct
answers True
Classify the statement about asexual and sexual reproduction as true or false:
Individuals may engage in costly or risky social behavior when reproducing sexually. correct
answers True
Classify the statement about asexual and sexual reproduction as true or false:
Hermaphroditic organisms may self-fertilize to reproduce asexually or cross-fertilize to
reproduce sexually. correct answers False
Classify the statement about asexual and sexual reproduction as true or false:
On average, siblings produced asexually share about 50% of their DNA sequence with each
other. correct answers False
Classify the statement about asexual and sexual reproduction as true or false:
A diploid parent always passes on two copies of its genes to its offspring during sexual
reproduction. correct answers False
How does the Red Queen hypothesis explain a fitness benefit of sexual reproduction?
-Sexually reproducing organisms carefully choose their partners, so only the fittest individuals
mate and produce high quality offspring.
-Offspring produced by sexual reproduction are less likely to inherit rare genetic disorders than
offspring produced by asexual reproduction.
-Species that use sexual reproduction live longer and produce more offspring than species that
reproduce asexually.
-Sexual reproduction produces genetic variation that allows some offspring to survive evolving
parasites. correct answers -Sexual reproduction produces genetic variation that allows some
offspring to survive evolving parasites.
Some species of freshwater snails can reproduce both sexually and asexually, but asexual
reproduction yields more offspring. Identify the condition that favors sexual reproduction.
, -Small population size.
-Heavily skewed sex ratio.
-High parasite abundance.
-Abundant food supply. correct answers -High parasite abundance.
Identify the conditions that favor self-fertilization over outcrossing in a hermaphroditic plant
species.
-Small population size.
-High herbivore activity.
-High pollinator activity.
-Rapid climate change. correct answers -Small population size.
-High herbivore activity.
What adaptations have evolved in plants that would help monoecious plants prevent inbreeding?
-Male and female gametes produced by the same plant have different number of chromosomes.
-Self-incompatibility genes prevent an individual from mating with itself.
-The plants produce many more female flowers than male gametes to ensure some amount of
cross-fertilization.
-The plants release pollen before stigmata fully mature.
-Female flowers grow above male flowers, which keeps pollen from falling down on stigmata of
the same plant. correct answers -Self-incompatibility genes prevent an individual from mating
with itself.
-The plants release pollen before stigmata fully mature.
-Female flowers grow above male flowers, which keeps pollen from falling down on stigmata of
the same plant.
Researchers have discovered that artificial selection pressure caused by human fishing activities
can skew sex ratios in salmon populations. This is due to the fact that larger fish are
preferentially harvested and male salmon are typically larger than female salmon. This means
that males are inadvertently harvested more often than females.
Choose the other salmon traits that might evolve in response to intense fishing practices that
selectively harvest larger adult fish.
-Stronger pathogen resistance.
-Faster development to maturity.
-Reduced adult body size.
-Darker body color patterns. correct answers -Faster development to maturity.
-Reduced adult body size.
For most species of turtles, embryos that incubate at lower temperatures typically produce males,
whereas those that incubate at higher temperatures produce females. Higher temperatures from
Classify the statement about asexual and sexual reproduction as true or false:
Offspring may be produced from vegetative tissues of the parent in asexual reproduction. correct
answers True
Classify the statement about asexual and sexual reproduction as true or false:
Harmful alleles may only be inherited by some offspring during sexual reproduction. correct
answers True
Classify the statement about asexual and sexual reproduction as true or false:
Individuals may engage in costly or risky social behavior when reproducing sexually. correct
answers True
Classify the statement about asexual and sexual reproduction as true or false:
Hermaphroditic organisms may self-fertilize to reproduce asexually or cross-fertilize to
reproduce sexually. correct answers False
Classify the statement about asexual and sexual reproduction as true or false:
On average, siblings produced asexually share about 50% of their DNA sequence with each
other. correct answers False
Classify the statement about asexual and sexual reproduction as true or false:
A diploid parent always passes on two copies of its genes to its offspring during sexual
reproduction. correct answers False
How does the Red Queen hypothesis explain a fitness benefit of sexual reproduction?
-Sexually reproducing organisms carefully choose their partners, so only the fittest individuals
mate and produce high quality offspring.
-Offspring produced by sexual reproduction are less likely to inherit rare genetic disorders than
offspring produced by asexual reproduction.
-Species that use sexual reproduction live longer and produce more offspring than species that
reproduce asexually.
-Sexual reproduction produces genetic variation that allows some offspring to survive evolving
parasites. correct answers -Sexual reproduction produces genetic variation that allows some
offspring to survive evolving parasites.
Some species of freshwater snails can reproduce both sexually and asexually, but asexual
reproduction yields more offspring. Identify the condition that favors sexual reproduction.
, -Small population size.
-Heavily skewed sex ratio.
-High parasite abundance.
-Abundant food supply. correct answers -High parasite abundance.
Identify the conditions that favor self-fertilization over outcrossing in a hermaphroditic plant
species.
-Small population size.
-High herbivore activity.
-High pollinator activity.
-Rapid climate change. correct answers -Small population size.
-High herbivore activity.
What adaptations have evolved in plants that would help monoecious plants prevent inbreeding?
-Male and female gametes produced by the same plant have different number of chromosomes.
-Self-incompatibility genes prevent an individual from mating with itself.
-The plants produce many more female flowers than male gametes to ensure some amount of
cross-fertilization.
-The plants release pollen before stigmata fully mature.
-Female flowers grow above male flowers, which keeps pollen from falling down on stigmata of
the same plant. correct answers -Self-incompatibility genes prevent an individual from mating
with itself.
-The plants release pollen before stigmata fully mature.
-Female flowers grow above male flowers, which keeps pollen from falling down on stigmata of
the same plant.
Researchers have discovered that artificial selection pressure caused by human fishing activities
can skew sex ratios in salmon populations. This is due to the fact that larger fish are
preferentially harvested and male salmon are typically larger than female salmon. This means
that males are inadvertently harvested more often than females.
Choose the other salmon traits that might evolve in response to intense fishing practices that
selectively harvest larger adult fish.
-Stronger pathogen resistance.
-Faster development to maturity.
-Reduced adult body size.
-Darker body color patterns. correct answers -Faster development to maturity.
-Reduced adult body size.
For most species of turtles, embryos that incubate at lower temperatures typically produce males,
whereas those that incubate at higher temperatures produce females. Higher temperatures from
