Write out the growth equation including the following factors: natality, mortality, immigration, and
emigration. Provide a one-sentence explanation for the impact of each of these factors on the
population growth rate. What will be an ideal response?
dN/dt = N[(b-d) + (i-e)]
b = natality: increases the growth rate
d = mortality: decreases the growth rate
i = immigration: increases the growth date
e = emigration: decreases the growth rate
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Given a population that contains genetic variation, what is the correct sequence of the following events under the influence of natural selection?
1. Well-adapted individuals leave more offspring than do poorly adapted individuals. 2. A change occurs in the environment. 3. Genetic frequencies within the population change. 4. Poorly adapted individuals have decreased survivorship. A) 2 ? 4 ? 1 ? 3 B) 4 ? 2 ? 1 ? 3 C) 4 ? 1 ? 2 ? 3 D) 4 ? 2 ? 3 ? 1 E) 2 ? 4 ? 3 ? 1
Your friend examines an ivy vine growing on the side of a campus building and says, “Look – some of the branches on this plant have a different morphology. The leaf shapes and patterning are different, and there are flowers on some branches but not others. There must have been a mutation!” You respond,
A. “I think you’re right. Maybe there was a mutation in the LEAFY (LFY) gene, and the loss of LFY has promoted flowering and had pleiotropic effects on leaf morphology.” B. “No, those branches have just undergone phase change. Now they’re in the adult form, and have become competent to respond to flowering signals.” C. “I think you’re right. Maybe the embryonic flower (emf) gene is being overexpressed, and that’s causing flowers to form.” D. “No, those morphological changes are just evidence that this plant’s environment has changed during its lifetime.” Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about flowers? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following prokaryotic nutritional
groups use CO2 and sunlight to produce energy? a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. all of these
Which of the following is (are) the leading cause of death in the world?
a. Diabetes b. Infectious diseases c. Heart diseases d. Cancer