Which is an example of extinction due to overspecialization of a species?
a. an organism dispersed to an island and no longer able to interbreed with individuals on the mainland.
b. the Devil's Hole Pupfish, which is found in only one spring-fed water hole in the Nevada desert
c. a fruit fly living on an apple tree and not coming in contact with another fruit fly of the same species living on a hawthorne tree
d. the silversword plants of the Hawaiian Islands adapting to a variety of Hawaiian habitats
e. the absolute dependence of the Karner blue butterfly on the blue lupine plant for food
Ans: e. the absolute dependence of the Karner blue butterfly on the blue lupine plant for food
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In mice, the allele for black fur is dominant to the allele for brown fur. If a male heterozygous black mouse is crossed with a female brown mouse, what percentage of the F1 offspring do you predict will be homozygous? ( Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5 )
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? Gather Content · What do you already know about crosses and genotype ratios? 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?
In all types of chemoreceptors, receptor cells develop receptor potentials in response to ________
A) changes in the movement of the surrounding molecules B) the electrical properties of the surrounding cells C) chemicals dissolved in a fluid such as blood or saliva D) the addition of positively charged proteins
During the light-dependent reactions, due to electron transport, the thylakoid space becomes
A. more acidic than the stroma. B. the site where the Calvin cycle occurs C. the site of NADPH production. D. the site of ATP synthesis.
Natural selection drives evolution through the following forces except
A. competition for food. B. predators. C. climate. D. reproduction. E. competition for mates.