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Which of the following evolutionary models assigns different rates for transitions and transversions?
EXPLANATION
Molecular Phylogenetics
- Nucleotide Substitution Models in Molecular Evolution:
- Jukes-Cantor (JC69) Model: Assumes equal base frequencies and a single uniform substitution rate for all transitions and transversions.
- Kimura 2-Parameter (K2P / K80) Model: Distinguishes between:
- Transitions ($A \leftrightarrow G, C \leftrightarrow T$, purine-to-purine or pyrimidine-to-pyrimidine), occurring at rate $\alpha$.
- Transversions ($A, G \leftrightarrow C, T$), occurring at rate $\beta$.
- It assigns a higher rate to transitions than transversions (transition bias), which is the standard model in DNA barcoding (COI) of fishes.
- nalysis:
- (Kimura-2 Parameter model): Correct.
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