Determining evolutionary relationships between species.

Determining evolutionary relationships between species.

• A. Population genetics
• B. Phylogenetics
• C. Pedigree
• D. Ecology

Answer: (B)

Phylogenetics is the study of evolutionary relationships among species. It uses data from DNA sequences, morphology, and other characteristics to infer how species are related through common ancestry. By identifying shared derived traits (synapomorphies) and applying methods like parsimony, maximum likelihood, or Bayesian inference, scientists build phylogenetic trees that depict lineage splits and ancestral connections. The branching pattern shows which species share more recent ancestors and how they diverged over time, directly addressing how species are related. In contrast, population genetics focuses on how allele frequencies change within populations over time, not on relationships among species. Pedigree analysis maps inheritance in families, not broad interspecies relationships. Ecology studies interactions among organisms and their environments, not their evolutionary histories.

Phylogenetics is the study of evolutionary relationships among species. It uses data from DNA sequences, morphology, and other characteristics to infer how species are related through common ancestry. By identifying shared derived traits (synapomorphies) and applying methods like parsimony, maximum likelihood, or Bayesian inference, scientists build phylogenetic trees that depict lineage splits and ancestral connections. The branching pattern shows which species share more recent ancestors and how they diverged over time, directly addressing how species are related. In contrast, population genetics focuses on how allele frequencies change within populations over time, not on relationships among species. Pedigree analysis maps inheritance in families, not broad interspecies relationships. Ecology studies interactions among organisms and their environments, not their evolutionary histories.