Metaphase II arrest is mediated by ________, a biochemical activity present in mature eggs.
Fill in the blank(s) with the appropriate word(s).
cytostatic factor
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Which of the following best describes the behavior of the human X and Y chromosomes during meiosis? Select all correct choices
A. The X and Y chromosomes have no regions of homology and therefore do not pair during meiosis. B. The X and Y chromosomes have regions of homology that allow them to pair during meiosis. C. Although the X and Y chromosomes pair during meiosis, crossover does not occur. D. Crossover occurs when the X and Y chromosomes pair during meiosis. E. None of these correctly describes the behavior of the human X and Y chromosomes during meiosis.
Which of these nutrients are likely to be required for nitrogen fixation? (check all that apply)
_____ Nitrogen _____ Hydrogen _____ Sulfur _____ Phosphorus _____ Oxygen _____ Chlorine
What is the biggest threat to the species in the Klamath-Siskiyou forest of southwestern Oregon and northwestern California? a. Logging of the forest
b. Degradation of the streams by pollution. c. Periodic fires that sweep through, burning thousands of acres. d. Development of the region for urban expansion. e. None of these choices.
What happens when you drink through a straw
What will be an ideal response?