The genotype of an organism that expresses a dominant trait can be determined by:
A: crossing the organism with a homozygous recessive organism.
B: crossing the organism with a heterozygous dominant organism.
C: crossing the organism with a homozygous dominant organism.
D: observing the phenotype of the progeny from any cross.
E: observing the genotype of the progeny from any cross.
Answer: A: crossing the organism with a homozygous recessive organism.
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You are studying the function of a recently identified gene in C. elegans. You perform genetic screens for several months in an attempt to isolate loss-of-function gene mutations, but your efforts are unsuccessful. Your advisor suggests you try another approach to eliminate gene function. The best technique to accomplish this goal would be
A. to design a repressor to bind to the operon of this gene. B. use a histone deacetylase to induce a transcriptionally inactive state. C. use a C. elegans strain with a homozygous TFIID mutation to prevent the translation initiation complex from forming. D. use RNA interference to prevent mRNA translation. 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 loss-of-function mutations? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
Deserts caused by global patterns of air
circulation are dry because
a. as the moist air above deserts rise, all of the water evaporates b. dry, descending air above deserts draws moisture from the soil c. the moist air above deserts is absorbed by the sandy desert soils d. because of the warm temperatures, all the moisture in the deserts is drawn away and is transported by air currents to the tropics e. all of the air currents above deserts have no contact with bodies of water
What do you predict would happen if you replace the Lac operator DNA from the Lac operon with the DNA from the operator region from the tryptophan operon?
(a) The presence of lactose will not cause allosteric changes to the Lac repressor. (b) The Lac operon will not be transcribed when tryptophan levels are high. (c) The lack of glucose will no longer allow CAP binding to the DNA. (d) RNA polymerase will only bind to the Lac promoter when lactose is present.
Each daughter cells has _______ as many chromosomes as the parent cell
Fill in the blank(s) with the appropriate word(s).