A storm blows a small group of migrating birds off course and they land on an island where they remain for 100 generations. At this time a second storm brings more birds from the mainland population to the island. These new birds cannot mate with the established birds even though they are woriginally from the same population. What mechanisms are likely to have been involved in bringing about this speciation? Select all that apply.
A. Polyploidy in the mainland bird population.
B. Founder effect
C. Genetic drift
D. Adaptation to a new ecological niche
Answer: D
You might also like to view...
Microorganisms in the human colon are more often being described as mutualistic with human hosts rather than commensalistic. Why has this change in the definition of a symbiotic relationship occurred?
A. As we learn more about the ecology of the human microbiome, we have learned that these organisms are dependent on the nutrients that we provide for their survival. B. As we learn more about the ecology of the human microbiome, we recognize our dependence on these organisms for immunity, vitamin production, and other essential processes. C. As we learn more about the makeup of the human digestive tract, we realize that some microorganisms are potentially pathogenic while others are not. D. All of the choices are correct.
During unfavorable growth conditions, many protozoa can convert to a resistant, dormant stage called a(n) ________.
A. trophozoite B. cyst C. sporozoa D. endospore E. seed
A cohort is ____
a. a collection of same-aged individuals of the same species b. any member of the same species c. any member of the same species and sex within a population d. a sexual mate e. a litter mate or sibling within a large population
Rats learning to press a lever to receive food is an example of
A. habituation. B. operant conditioning. C. classical conditioning. D. negative reinforcement. E. avoidance.