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TLS Online TPP Program
#Question id: 12233
#Unit 10. Ecological Principles
Monarch butterflies are protected from birds and other predators but the cardiac glycosides they incorporate into their tissues are from eating milkweed when they were in their caterpillar stage of development. The wings of a different species of butterfly, the Viceroy, look nearly identical to the Monarch so predators that have learned not to eat the bad-tasting Monarch avoid Viceroys as well. This example best describes
TLS Online TPP Program
#Question id: 12234
#Unit 10. Ecological Principles
All of the following have been used by plants to avoid being eaten except
TLS Online TPP Program
#Question id: 12235
#Unit 10. Ecological Principles
Which of the following are important biotic factors that can affect the structure and organization of biological communities?
TLS Online TPP Program
#Question id: 12236
#Unit 10. Ecological Principles
A plant species arrives at an island for the first time, where it is exposed to a new set of pollinators. Over the course of 20 generations, the characteristics of its flowers change. The figures above show the frequency distribution of petal length in the original colonizing population (Figure 1) and 20 generations later (Figure 2). Which of these explanations is consistent with the observed change in petal length?
TLS Online TPP Program
#Question id: 12237
#Unit 10. Ecological Principles
Which of the following occurred first during the separation of the elements of Pangaea through continental drift?
TLS Online TPP Program
#Question id: 12238
#Unit 10. Ecological Principles
The mussel Mytilus edulis thrives in saline habitats, in both the highly salty seawater of tidal zones and the less salty estuaries. This results in two kinds of populations: one adapted to the higher salt concentrations of the tidal zone, and one adapted to the lower salt concentrations of the estuary. It has been found that the more salt-tolerant populations have high frequencies of an allele that produces an enzyme involved in maintaining osmotic equilibrium. Conversely, estuarine mussels having the same enzyme seem to be disfavoured and have a much higher death rate than mussels without the allele. Adult estuarine populations do have lower frequencies of this allele. Each spring, large numbers of larvae from the salty habitats pour into the estuaries.
The invasion of the seawater larvae would be expected to facilitate change in the genetic structure of the estuarine population by a process called