You are conducting a genetic screen using Caenorhabditis elegans embryos to isolate mutations affecting anaphase (A). Therefore, you need to look for embryos in which
A. the poles do not move apart.
B. the spindle apparatus does not disassemble.
C. the centromeres do not move toward the poles.
D. sister chromatids are mismatched and therefore fail to separate.
Answer: C
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Which animal phylum lacks a network of nerve cells for gathering information from the environment?
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