10 Questions
Explain disruptive selection and provide an example.
Disruptive selection favors individuals with variations at opposite extremes of a trait over individuals with intermediate variations. Example: black-bellied seedcracker finch beak size.
How does stabilizing selection affect phenotypes in a population?
Stabilizing selection favors the most common phenotypes within a population, leading to a decrease in variability and an increase in the prevalence of the favored traits.
What is balanced polymorphism and how is it maintained in a population?
Balanced polymorphism refers to the maintenance of multiple alleles in a population. In the case of sickle cell anemia, both (HBa) and sickle-cell (HBs) hemoglobin alleles are present in stable frequencies.
Why do individuals with either very large or very small beaks have a higher chance of survival in the black-bellied seedcracker finch example?
Individuals with either very large or very small beaks have a higher chance of survival because larger beaks are better for larger seeds, and smaller beaks are better for smaller seeds.
How does human birth weight exemplify stabilizing selection?
Human birth weight exemplifies stabilizing selection as babies born more or less than 3 kg are less likely to survive and reproduce, favoring those closer to 3 kg.
What is the term for the situation when two diverging groups maintain stable frequencies of both alleles due to selection pressures?
Balanced polymorphism
What is the term for the barrier that prevents the hybrid zygote from developing into a viable, fertile adult?
Postzygotic barrier
Give an example of a prezygotic barrier that prevents mating between species based on their habitats.
Habitat isolation
What is the term for the concept that defines a species based on a unique set of phenotypic features?
Morphological species concept
Which species concept focuses on the potential to interbreed and produce viable, fertile offspring within a group of populations?
Biological species concept
Learn about disruptive selection in evolution where individuals with extreme variations of a trait are favored over those with intermediate variations. Explore how this process leads to the evolution of specific traits in populations over time.
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