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#common ancestor

2 public questions tagged with this topic.

CLADOGRAM

Which group lacks common ancestor?

Polyphyletic reflects key principle in quiz on cladogram+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Polyphyletic aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Polyphyletic fits helps integrate natural selection, environment.

Ref: Baum & Smith, Tree Thinking, Synapomorphy and Monophyly.

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Animal Classification

Amphibians evolved from a common ancestor with

Amphibians share most recent common ancestor with lungfishes within Sarcopterygii lobe-finned clade, more closely related than to actinopterygian ray-finned fishes, reptiles, birds or mammals which are nested crown tetrapods. Shared derived characters include internal choanae connecting nasal cavity to mouth, fleshy pectoral fins with single basal element homologous to humerus, pulmonary respiration, similar neurocranial structure and tooth enamel. Molecular phylogenies concatenate nuclear and mitochondrial genes placing Dipnoi sister to Tetrapoda, supported by transitional fossils like Tiktaalik and Panderichthys bridging gap, lungfishes therefore closest living fish relatives.

Ref: Campbell Biology 12th ed. Chapter 34 Sarcopterygian Phylogeny; NCERT Class 11 Chapter 4 Lungfishes and Tetrapods

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