Science Slideshow Ch 6.3
Published on Nov 19, 2015
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PRESENTATION OUTLINE
COMPARATIVE ANATOMY
- The study of similarities and differences among structures of living species
- The skeletons of humans and birds are constructed of similar elements arranged similarly
HOMOLOGOUS STRUCTURES
- Body Parts of organisms that are similar in structure and position but different in function
- there is homologous similarity between a bat's wing and a horse's leg
ANALOGOUS STRUCTURES
- body parts that perform a similar function but differ in structure
- Analogous structures show that different organisms have evolved similar adaptations in similar environments
VESTIGIAL STRUCTURES
- body parts that have lost their original function through evolution
- Ostrich wings are examples of vestigial structures
EMBRYOLOGY
- The science of the development of embryos from fertilization to birth
- In the late 19th century, a German zoologist named Ernst Haeckel proposed a theory according to which embryonic development is essential a condensation of historical evolutionary development
