JoVE evolutionary relationships
Cladistics: The classification of organisms based on physical characteristics, often visually represented by dendrograms.
Modern Techniques: Advances in technology allow for DNA comparison. Humans share approximately of their genetic code, and tracking these similarities across species enables the construction of phylogenetic trees.
Bioinformatics: An interdisciplinary field combining statistics, mathematical modeling, and computer science to analyze genetic data.
Phylogenetic Analysis Methods:
Molecular Phylogeny: Sequences specific genetic loci to compare species. Challenges include varying rates of evolution and horizontal gene transfer.
Multi-Locus Sequence Typing (MLST): Sequences multiple housekeeping genes (essential, conserved genes). While useful for bacterial phylogenies, it may lack the resolution needed for strain-level identification.
Whole Genome Sequencing (WGS): Sequences an organism's entire genome, including mitochondrial and chloroplast DNA.
Provides high-resolution data to identify mutations, specific markers, and distinct strains or populations.
Offers finer detail than targeted sequencing approaches.