Identify the following point mutations represented in DNA...

Identify the following point mutations represented in DNA and in RNA as (1) transitions, (2) transversions, or (3) reading frameshifts. (a) A to G; (b) C to T; (c) C to $\mathrm{G} ;(\mathrm{d}) \mathrm{T}$ to $\mathrm{A} ;(\mathrm{e})$ UAU ACC UAU to UAU AAC CUA (f) UUG CUA AUA to UUG CUG AUA.

Identify the following point mutations represented in DNA and in RNA as (1) transitions, (2) transversions, or
(3) reading frameshifts. (a) A to G; (b) C to T; (c) C to
$\mathrm{G} ;(\mathrm{d}) \mathrm{T}$ to $\mathrm{A} ;(\mathrm{e})$ UAU ACC UAU to UAU AAC CUA
(f) UUG CUA AUA to UUG CUG AUA.

Key Concepts

Frameshift Mutations

Frameshift mutations result from insertions or deletions of nucleotides that are not in multiples of three, which shifts the reading frame of the genetic code. This change can drastically alter the downstream amino acid sequence, usually leading to a nonfunctional protein or premature stop codon.

Transition Mutations

Transition mutations are changes where a purine is replaced by another purine (adenine ? guanine) or a pyrimidine is replaced by another pyrimidine (cytosine ? thymine or cytosine ? uracil in RNA). Because of the similar chemical structure between the bases, transitions are often less disruptive to the DNA structure.

Point Mutations

Point mutations are changes at a single nucleotide in the genetic sequence. They can result in a change in the amino acid sequence in the expressed protein, have no effect (silent mutations), or cause a premature stop codon, depending on where and how the mutation occurs.

Transversion Mutations

Transversion mutations occur when a purine is replaced by a pyrimidine or vice versa. This type of mutation involves a change in the size and structure of the base, often leading to greater structural distortions and potentially more significant functional impacts on the protein encoded by the gene.

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