In an attempt to breed winter barley that is resistant to barley mild mosaic virus, agricultural researchers cross a susceptible domesticated strain with a resistant wild strain. The F1 plants are all susceptible, but when the F1 plants are crossed with each other, some of the F2 individuals are resistant. Is the resistance allele recessive or dominant? How do you know?
What will be an ideal response?
Answer: The resistance allele is recessive because it was not expressed in the F1 generation but was expressed in some plants of the F2 generation.
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How do sphagnum mosses contribute to the carbon cycle? Select all correct choices
A. As decomposers, they release large amounts of CO2 into the atmosphere. B. They produce phenols, which release the carbon stored in peat bogs. C. As heterotrophs, they remove large amounts of CO2 from the atmosphere. D. They produce protons, which limit decomposition and CO2 production in peat bogs.
Oxidation is defined as the removal of ________. In biological systems, these are usually accompanied by protons in a process called ________.
Fill in the blank(s) with the appropriate word(s).
Medically important bacteria are often
A. grown on agar containing blood. B. grown at 37?C. C. grown on agar containing chocolate. D. grown at a pH of 5. E. grown on agar containing blood AND grown at 37?C.
The three main kinds of seedless vascular plants are: ________, ________, and ________
Fill in the blank(s) with correct word