One hallmark of speciation is ____
a. lack of change in reproductive behaviors
b. a decrease in balanced polymorphisms
c. an increase in fixed alleles
d. decreased genetic diversity of populations
e. end of gene flow between populations
ANSWER: e
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A cell biologist examines a diploid cell from a particular species of butterfly during prometaphase of mitosis and determines that 10 centromeres are present. Based on this finding, how many chromatids should be present in a single cell from this species in metaphase I of meiosis?
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about the number of chromatids in a cell? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
One of the first successful applications of genetic engineering was the commercial production of ____
a. clotting factor b. insulin c. hemoglobin d. collagen e. human growth factor
The per capita growth rate (r) is ____ per
mouse per month in a population of 1,000 mice where 500 mice are born and 400 mice die monthly. a. 0.1 b. 0.2 c. 0.3 d. 0.4 e. 0.5
The ultimate size of a cell is NOT limited by which one of the following?
A. the strength of the membrane B. the cell surface area C. the surface-area-to-volume ratio D. the size of the nucleus