Molecular biology has transformed the study of evolution from a discipline reliant primarily on fossil records and morphological comparisons into one powered by precise, testable genetic data. The question of how does molecular biology provide evidence for evolution is answered through the examination of DNA sequences, protein structures, and genomic patterns that reveal shared ancestry with remarkable clarity. When scientists compare the genetic makeup of vastly different organisms, they consistently uncover similarities that cannot be explained by convergent evolution alone, pointing instead to a common origin that diverged over millions of years That's the whole idea..
The most direct line of evidence comes from DNA sequence comparison. Across species, genes that perform similar functions often show striking similarities in their nucleotide order. Take this: the cytochrome c protein, essential for cellular respiration, is nearly identical in structure and function from yeast
