discuss the anterior limb o recognize that there is not much variation in the bones of the anter

Name: discuss the anterior limb o recognize that there is not much variation in the bones of the anterior limb o compare the major bones present in the groups we discussed o describe the importanc 76424
Uploaded: 2022-06-09T15:19:18-08:00
Duration: 1 min 43 s
Channel: Sri K
Description: discuss the anterior limb o recognize that there is not much variation in the bones of the anterior limb o compare the major bones present in the groups we discussed o describe the importanc 76424

Discuss the anterior limb o recognize that there is not much...

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5.12 COMPARATIVE ANATOMY - THE PENTADACTYL LIMB All the tetrapod animals (amphibia, reptiles, birds, mammals) show variations on the same basic skeletal structure, which may be modified in various ways depending on the tetrapod group the animal belongs to, and the requirements of the animal’s way of life. Some bones may become vestigial or absent in the adults, others may be highly modified, and groups of bones develop in different ways in different tetrapod groups. We will examine this process by looking at the limbs of tetrapods. All tetrapods possess a bone structure in their limbs based on the pentadactyl (five-fingered or toed) limb (see Fig. 21.13 in Mason et al. 2020). This limb is hypothesised to have been evolutionarily derived from the bone structure of the fins in the lobe-finned fishes, the putative ancestors of the tetrapods. The basic unmodified structure of the pentadactyl limb is the same in all tetrapods. Write the names of the bones involved in the pentadactyl limbs in the table below, matching the bones of the fore limb with those of the hind limb. Table 5.07. Bones of the pentadactyl limbs. (6 points) Names of equivalent bones Region fore limb hind limb closest to body Humerus 1. 2nd closest (one of pair) Ulna 2. 2nd closest (one of pair) Radius 3. 3rd closest Carpals 4. 4th closest Metacarpals 5. 5th closest Phalanges 6. Q5.41.01. ____ is the hind limb equivalent of the humerus in the fore limb. (FIBQ, 1 point) Q5.41.02. ____ is the hind limb equivalent of the ulna in the fore limb. (FIBQ, 1 point) Q5.41.03. ____ is the hind limb equivalent of the radius in the fore limb. (FIBQ, 1 point) Q5.41.04. ____ is the hind limb equivalent of the carpals in the fore limb. (FIBQ, 1 point) Q5.41.05. ____ is the hind limb equivalent of the metacarpals in the fore limb. (FIBQ, 1 point) Q5.41.06. ____ is the hind limb equivalent of the phalanges in the fore limb. (FIBQ, 1 point) The exact form the bones of the pentadactyl limb take in any given tetrapod, and the modification or reduction in number of bones that occurs, depends on the lifestyle that the species has adopted. By looking at the form the limbs in a number of tetrapods, we can see examples of homology. In contrast, the wings of birds and butterflies are examples of convergence.

Sri K.

Based on similarities among forelimbs, what bones did the most recent common ancestor of tetrapods probably possess? In your response, refer to the bones and their connections (for example, the scapula is connected to the humerus).

Haricharan G.

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Research On Vertebrate Forelimb Osteology: Examining the Bones Figure 15.4 shows several bones in the forelimbs of vertebrates that are homologous structures. For each organism, identify the bones that resemble a common ancestor and the bones that differ. Ulna Carpals Metacarpals Phalanges Explain how modifications to the structure of some of these bones were necessary for the existence of the organism. Sharks and dolphins have many analogous structures that allow them to meet the demands of their habitat. Why are these structures similar but not homologous?

Adi S.