All living things descend from shared ancestors, evidenced by universal DNA and genetic code.
Evidence includes shared genetic code, similar biochemistry (ATP, DNA), homologous structures, vestigial organs and DNA similarity (humans and chimpanzees share about 98.8 percent of comparable sequence). Nested patterns of similarity allow a tree of life to be built.
Genes such as those for cytochrome c are conserved across kingdoms.
All living things descend from shared ancestors, evidenced by universal DNA and genetic code.
Common Ancestry is one of the 53 topics in Evolution. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Homologous Structures, Vestigial Structures, Divergent Evolution.
Pseudogenes shared by humans and other primates, such as the broken vitamin C gene, point to common ancestors.
Common Ancestry is a Beginner topic, so no earlier topic is required. Other Beginner topics in Evolution that pair well with it include Evolution, Natural Selection, Charles Darwin.
The closest topics to Common Ancestry are Homologous Structures, Vestigial Structures, Divergent Evolution, Phylogenetic Trees. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Common Ancestry. To practise the whole of Evolution, use the Evolution quiz.
Common Ancestry: All living things descend from shared ancestors, evidenced by universal DNA and genetic code. Homologous Structures: Body parts with similar structure from a common ancestor but different functions, like a human arm and bat wing. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Homologous Structures and explain the difference aloud. Finally, take the Evolution quiz and come back to this page for any question you miss.
Body parts with similar structure from a common ancestor but different functions, like a human arm and bat wing.
🦎 EvolutionReduced features retained from ancestors that have lost most of their original function, such as the human appendix.
🦎 EvolutionRelated species become increasingly different as they adapt to separate environments.
🦎 EvolutionBranching diagrams that show inferred evolutionary relationships among species.
🦎 Evolution