A strain of a cereal grain can be either dark tan, medium-dark tan, medium tan, light tan, or cream colored. When a dark tan and a cream plant are crossed, all F1 are medium tan
The F2 are distributed in a ratio of 1:4:6:4:1 from darkest to lightest. How many additive alleles are needed to produce the darkest phenotypes?
4
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Portable UV room sterilizing units are being used to reduce endospores of Clostridioides difficile in hospital rooms after patients have vacated. Which of the statements best describes this application?
A. UV radiation will destroy C. difficile endospores and has residual sporicidal effects that will persist after the unit has been removed from the patient's room. B. UV radiation will destroy C. difficile endospores and penetrates well to all locations within the room. C. UV radiation will destroy C. difficile endospores assuming it is applied for a long enough period and directly contacts all surfaces. D. UV radiation will not destroy C. difficile endospores.
Plants first moved onto land at least ________ years ago
A) 65 million B) 475 million C) 1.2 billion D) 3.5 billion
Soil formation is due to
A. decomposition of organic matter. B. chemical weathering of rock. C. mechanical weathering of bedrock. D. All of the choices are correct.
Answer the following questions true (T) or false (F)
1. Supportive care is the only treatment for staphylococcal food poisoning. 2. Marine mammals are the normal host for Anisakis simplex adults. 3. Invasive extraintestinal amebiasis is the most severe type of Entamoeba histolytica infection.