The most accurate description of an organism with genotype AaBb is
a. homozygous dominant.
b. heterozygous.
c. heterozygous dominant.
d. homozygous recessive.
e. heterozygous recessive.
ANSWER: b
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Viruses travel through animals mainly by lysing cells and then spreading to other cells. Plant cells are not easily lysed. If a pathogen enters a plant cell and does not initiate a hypersensitive response, what is the most likely way the virus would spread to other plant cells?
A. Through the chloroplasts. B. Directly through the cell wall. C. Through the central vacuole. D. Through the plasmodesmata. E. Through transport vesicles. 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 how plant viruses spread between cells? 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?
Genetic studies of an animal show that eye color is controlled by an autosomal gene with the dominant allele (R) for
red eye color and the recessive allele (r) for yellow eye color. A second autosomal gene has the dominant allele (T) for paws with thumbs and the recessive allele (t) for paws without thumbs. The genetic cross RRTT x rrtt creates offspring with genotype RrTt. One of those dihybrids is mated in a testcross (RrTt x rrtt). If the two genes are completely linked (no recombination occurs between them), then the testcross should produce offspring with the phenotype ratio ____.
a. 3 red-eyed with thumbs : 1 yellow-eyed without thumbs. b. 1 red-eyed with thumbs : 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs. c. 1 red-eyed with thumbs : 1 yellow-eyed without thumbs. d. 9 red-eyed with thumbs : 3 yellow-eyed with thumbs: 3 red-eyed without thumbs: 1 yellow-eyed without thumbs. e. 1 yellow-eyed with thumbs : 1 red-eyed without thumbs.
The oldest fossil organisms presently known have been dated at approximately how many years old?
A) more than 4.5 billion B) less than 1.7 billion C) 4.5 billion D) 1.7 billion E) 3.4 billion
Why are acid fast organisms difficult to stain?
What will be an ideal response?