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Homology (biology)
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In biology, homology is similarity in anatomical structures or genes between organisms of different taxa due to shared ancestry, regardless of current functional differences. Evolutionary biology expl
Pierre Belon systematically compared the skeletons of birds and humans in his Book of Birds (1555).
Pierre Belon systematically compared the skeletons of birds and humans in his Book of Birds (1555).
The front wings of beetles have evolved into elytra, hard wing-cases.
The front wings of beetles have evolved into elytra, hard wing-cases.
Dragonflies have the ancient insect body plan with two pairs of wings.
Dragonflies have the ancient insect body plan with two pairs of wings.
The hind wings of flies such as this cranefly have evolved divergently to form small club-like halteres.
The hind wings of flies such as this cranefly have evolved divergently to form small club-like halteres.
Convergent evolution
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Convergent evolution is the independent evolution of similar features in species of different lineages. Convergent evolution creates analogous structures that have similar form or function but were no
Homology (biology)
…of homologous organs are analogous organs which do similar jobs in two taxa that were not present in their most recent common ancestor but, rather, evolved separately. For example, the wings of insects and birds evolved independently in widely separated groups, and converged functionally to support powered flight…
Red fox skeleton
Red fox skeleton
Skulls of thylacine (left), timber wolf (right)
Skulls of thylacine (left), timber wolf (right)
A mormyrid electric fish of Africa
A mormyrid electric fish of Africa
Vertebrate wings are partly homologous (from forelimbs), but analogous as organs of flight in (1) pterosaurs, (2) bats, (3) birds, evolved separately.
Vertebrate wings are partly homologous (from forelimbs), but analogous as organs of flight in (1) pterosaurs, (2) bats, (3) birds, evolved separately.