Anatomical Homology

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Anatomical Homology
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Anatomical Homolgy
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Embryonic Arches
Mandibular Arch (ventral) Mandibular Arch (dorsal) Hyoid Arch (dorsal)
Shark Meckel's cartilage Palatoquadrate cartilage Hyomandibular cartilage
Amphibian Articular (bone) Quadrate (bone) Stapes
Mammal Malleus Incus Stapes
Mandibular Arch
Hyoid Arch
Otic pit
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Von Baer - Comparative Embryology
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Anatomical Homology/Analogy
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wild-type
Antennapediamutant
Fly heads
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Hoxb-4 knockout
wildtype mouse
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Gene/Gene Expression Homology
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Gene/Gene Expression Homology
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Signaling pathways
Drosophila (invertebrate) Xenopus
(vertebrate) dpp BMP-4 (dorsalization) (ven
tralization) SOG chordin (blocks dpp,
ventralization) (blocks BMP-4,
dorsalization) tolloid (TLD) xolloid (cleaves
SOG, dorsalization) (cleaves chordin,
ventralization)