Recombination of alleles on nonsister chromatids occurs during
a. anaphase I.
b. meiosis II.
c. telophase II.
d. crossing over.
d
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Chromosomes are often represented as an X, with two sister chromatids attached at the centromere. Do chromosomes always look like an X?
A. No, chromosomes only look like an X following DNA replication, and before cell division; the rest of the time, they only have one sister chromatid each. B. No, chromosomes only look like an X right after cell division; the rest of the time, they have only one sister chromatid each. C. Yes, chromosomes are always made up of two sister chromatids attached. D. No, chromosomes only look like an X when condensed, but they always have two sister chromatids attached.
Which sedimentary rock is associated with a high-energy environment (such as a very fast-flowing turbulent stream)?
If you didn't consume enough niacin (vitamin B3), you would have diarrhea since you would have what disease?
A. scurvy B. pellagra C. rickets D. beriberi E. anemia
The kidney releases ____________________ to stimulate red blood cell formation. Fill in the blank(s) with the appropriate word(s)