However, biologists often depart from high school texts in their analysis of analogies (e.g., Hall 2007 Gregory 2008).
This is the view presented by standard biology textbooks. Animals completely different from each share the same similarities for different functions.So far, so good. 'What could be more curious than that the hand of man formed for grasping, that of a mole, for digging, the leg of a horse, the paddle of a porpoise and the wing of a bat, should all be constructed on the same pattern and should include similar bones and in the same relative positions?’.This pattern has persisted in all terrestrial vertebrates, and aquatic vertebrates such as seals.The limb in amphibians had 3 parts: hand/foot, with five digits (fingers/toes), a lower limb containing two bones, and an upper limb containing one bone.
Amphibians immediate ancestors were fleshy-finned fish. Vertebrates (animals with backbones) evolved from primitive amphibians. Typical limb of mammals, birds, reptiles, and amphibians. The more closely the organisms are related, the more similar the homologous structures between organisms. The common ancestry of the species can be seen in the structure and development of homologous structures, even if their function is different. These similarities between these structures are evidence that life on Earth has a common ancestor that the present species have evolved from over time. Although they are used differently, the basic skeletal structure is the same. 
The forelimbs of humans and bats are homologous structures. May not perform the same function but they share a common ancestral origin. Structures derived from a common ancestor or same evolutionary or developmental origin. Homologous Structures Erica, Nao, Christian and Justine
0 kommentar(er)
