The number of different alleles for ABO blood types in the total human population is
a. 4.
b. 6.
c. 9.
d. 2.
e. 3.
E
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You created a worm that expresses a human Bcl-2 transgene, and you are crossing the transgene into a homozygous ced-9 mutant background. However, you inadvertantly used a clone of Bcl-2 with a mutation in the BH domain, which is essential for function. What results do you expect for the ced-9 mutants with the mutant Bcl-2 transgene?
A. 131 cells will die. B. All 1090 cells will die. C. All 1090 cells will live. D. 959 cells will die. 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 already know about the apoptosis pathway? 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?
Shown below is an electron micrograph of part of a myofibril from a relaxed muscle fiber. Which of the labeled regions will not shorten when the muscle contracts?
A. Sarcomere B. A band C. I band D. H band
In the accompanying figure, the responses initiated at point A in response to an increase in body temperature include:
a. a decrease in sweating and panting
b. a decrease in muscle activity
c. a constriction of blood vessels
d. an increase in metabolism
e. shivering
Choose the true statement below
A) When two genes are over 50 map units apart, a crossover can theoretically occur 100% of the time. B) The percentage of tetrads involved in exchange between two genes is equal to the number of recombinant progeny seen. C) Linkage (viewed from results of typical crosses) always occurs when two loci are on the same chromosome. D) A single crossover on a chromosome will always yield the recombinant phenotype of the genes you are interested in. E) When two genes are over 50 map units apart, a crossover would theoretically occur 0% of the time.