BIO342H5 Lecture Notes - Heritability, Phagocytosis, Richard Lenski
Document Summary
Bio342 lecture 2: evidence for evolution and origins of life. Recognize how fossils contribute to our understanding of evolution. Understand the hypothesis for the evolution of early life. Phenotypic evolution occurs when a change in the frequency of alleles or genotypes cause a change in the distribution of phenotypic traits within a population. All organisms present or past are descended from a single common ancestor. During this time lineages have genetically and phenotypically changed and split to form many branches. This is the concept of: descent of modification. Single lineage, split to more lineage, some went extinct, some continue to present day to have diversity today. A phylogeny is a representation of the history of descent and thus common ancestry: relationships between organisms, node - single population over 100 millions of years - diversified and split. 2 forms of evidence: pattern based evidence: fingerprints of evolution that have been left through time, direct evidence (watch it happen)
