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Evidence for evolution reveals that closely related organisms have many
characteristics.
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GPT-5 mini
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Yes — that is a key prediction of evolution by common descent. Closely related organisms tend to share many characteristics because they inherited them from a recent common ancestor. Over time some traits are modified, but many anatomical, developmental and molecular features remain similar.
Types of evidence that show these shared characteristics
- Comparative anatomy: homologous structures (same basic bone plan in human arm, bat wing, whale flipper) indicate common ancestry.
- Embryology: related animals show similar early development (e.g., vertebrate embryos have pharyngeal pouches and a notochord).
- Molecular biology: closely related species have more similar DNA and protein sequences (humans and chimpanzees share ~98–99% of nucleotide sequence).
- Biochemistry and physiology: shared metabolic pathways and conserved genes (Hox genes, Krebs cycle enzymes).
- Paleontology and transitional fossils: intermediate forms link groups (e.g., Archaeopteryx between dinosaurs and birds).
- Biogeography: related species are often geographically clustered in ways explained by descent with modification (Darwin’s finches on the Galápagos).
Contrast with convergent evolution: unrelated species can evolve similar (analogous) features when adapting to similar environments (wings of bats and insects), so similarity alone must be tested (morphology + molecular data + fossils) to infer true relationships.
Scientists combine these lines of evidence to build phylogenetic trees that reflect how species are related.
Types of evidence that show these shared characteristics
- Comparative anatomy: homologous structures (same basic bone plan in human arm, bat wing, whale flipper) indicate common ancestry.
- Embryology: related animals show similar early development (e.g., vertebrate embryos have pharyngeal pouches and a notochord).
- Molecular biology: closely related species have more similar DNA and protein sequences (humans and chimpanzees share ~98–99% of nucleotide sequence).
- Biochemistry and physiology: shared metabolic pathways and conserved genes (Hox genes, Krebs cycle enzymes).
- Paleontology and transitional fossils: intermediate forms link groups (e.g., Archaeopteryx between dinosaurs and birds).
- Biogeography: related species are often geographically clustered in ways explained by descent with modification (Darwin’s finches on the Galápagos).
Contrast with convergent evolution: unrelated species can evolve similar (analogous) features when adapting to similar environments (wings of bats and insects), so similarity alone must be tested (morphology + molecular data + fossils) to infer true relationships.
Scientists combine these lines of evidence to build phylogenetic trees that reflect how species are related.
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