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1) A segment of DNA has the following sequence:
ATCG
TAGC
a. What would be the sequence immediately after reaction with nitrous acid? Use the letter H to stand for hypoxanthine and U to stand for uracil.
b. After mutation has occurred, nitrous acid is removed and the DNA is replicated for two generations. After replication, base excision repair mechanisms replace any hypoxanthine or uracil nucleotides. What will the sequences of the DNA products be at the end of this process?
Genes A, B, and C are linked on a chromosome and found in the order A-B-C. Genes A and B recombine with a frequency of 10 percent, and genes B and C recombine at a frequency of 25 percent.
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