As the result of exposure to a mutagen,cytosine is substituted for thymine in one strand of DNA.Upon subsequent DNA replication,one of the daughter cells will have a GC pair in this position instead of an AT pair.This is called a(n)__________ mutation.

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A mutation in which one purine is substituted for another (A for G, or G for A) or one pyrimidine is substituted for another (C for T, or T for C) is called a transition mutation. In this case, thymine was substituted for cytosine, which is not a transition mutation. However, upon replication, the complementary base to cytosine will be guanine, resulting in a GC pair instead of an AT pair, which will be a transition mutation. Transversion is a mutation in which a purine is substituted for a pyrimidine or vice versa, frameshift mutation results from the insertion or deletion of one or a few nucleotides, and insertion refers to the addition of one or more nucleotides.

As the Result of Exposure to a Mutagen,cytosine Is Substituted