High increases the ability of a species to survive major changes... | Agrigyan

• 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.

• Maximum Parsimony (MP):
• Maximum parsimony is an optimality criterion used in phylogenetic analysis (cladistics) to reconstruct evolutionary trees.
• Based on Occam's razor, it identifies the phylogenetic tree topology that requires the minimum total number of evolutionary character-state changes (mutations) to explain the observed sequence data.
• nalysis:
• (Phylogenetic analysis): Correct.

Correct option: (2) Phylogenetic analysis

• Comparison of Molecular DNA Markers:
• Microsatellites (Simple Sequence Repeats, SSRs / STRs):
• Tandem repeats of $1-6\text{ bp}$ nucleotide motifs.
• Inherited in a strictly co-dominant Mendelian fashion (distinguishes homozygotes from heterozygotes).
• Exceptionally high allelic polymorphism due to replication slippage creating high mutation rates ($10^{-3}$ to $10^{-4}$ per locus per generation).
• RAPD: Dominant, low reproducibility.
• RFLP: Co-dominant, but biallelic and low polymorphism.
• SNPs: Co-dominant, but typically biallelic per locus.
• nalysis:
• (Microsatellite markers): Correct.

Correct option: (3) Microsatellite markers

• BLAST Expect Value (E-Value):
• The E-value describes the number of hits one can expect to see by chance when searching a database of a particular size.
• lower E-value (closer to zero) indicates a more statistically significant match:
• $E = 1$ or higher: Likely a random chance alignment.
• $E \le 10^{-5}$ to $10^{-10}$ (recorded as $10^{-10}$ / $100(-10)$): Highly significant, authentic biological homology.
• nalysis:
• (10^(-10)): Correct. Indicates a high-confidence, non-random biological alignment.

Correct option: (3) 100(-10)