In scientific research, which application best describes how mitochondrial DNA (mtDNA) is commonly used?

• A. Determining paternal lineage because mtDNA is inherited exclusively from the father in most animals
• B. Mapping recombination hotspots across all chromosomes because mtDNA undergoes frequent meiotic crossing over like nuclear DNA
• C. Tracing maternal lineage and inferring evolutionary relationships because mtDNA is typically inherited maternally and mutates at a useful rate for phylogenetic analysis
• D. Identifying allele frequencies for most Mendelian traits because mtDNA encodes the majority of genes controlling human phenotypes

Answer: (C)

Verified step by step guidance

1. Understand the inheritance pattern of mitochondrial DNA (mtDNA): mtDNA is inherited almost exclusively from the mother, not the father, in most animals.
2. Recognize that mtDNA does not undergo meiotic recombination like nuclear DNA, so it is not useful for mapping recombination hotspots across chromosomes.
3. Know that mtDNA mutates at a rate that allows scientists to track evolutionary changes over generations, making it useful for phylogenetic analysis.
4. Realize that mtDNA contains a small number of genes mostly related to mitochondrial function, so it is not the primary source for studying most Mendelian traits.
5. Conclude that the best application of mtDNA in scientific research is tracing maternal lineage and inferring evolutionary relationships due to its maternal inheritance and mutation rate.