The following are specific characteristics in certain phyla. On your phylogeneti

Question

The following are specific characteristics in certain phyla. On your phylogenetic tree (pictured below), place these characteristics in the correct location and in the space below explain whether they are analogous or homologous. Note: both answers are possible, you will be evaluated on your reasoning. The characterisitcs are: eyes,jointed/paired appendages, and a blastophore that develops into the mouth, lophophore, trochophore larvae.

Here's whats on the phylogenetic tree: parazoa, eumetazoa, radial symmetry, bilateral symmetry, lophophore, trochophore larvae, acoelomate, pseudocoelomate, coelomate, protostome, deuterostome, lophotrochozoa, ecdysozoa

Simplified question: take the phylogenetic tree pictured below (also written above) and place those characteristics (also written above) along side the correlating options. Then afterwards, describe whether those characteristics are analogous or homologous.

2. Use information obtained in this class to draw a phylogenetic tree for the animal phyl:a you examined. Note: Your tree should be consistent with the information provided, but several trees are possible. Also, this tree will be based on derived characters rather than a dissimilarity matrix. Use the following terms in your tree: parazoa, eumetazoa, radial lomate, coelomate, protostome, deuterostome, lophotrochozoa, ecdysozoa. fara Zoa .lateral Froto Sont coeloma te aAnelida bryo2 chordato echieadamat Exercise 3: Animal Diversity

Explanation / Answer

From the given phyogenetic tree we can say that the characteristics placed are homologous in nature. For species to have common ancestory the strongest evidence has been the presence of similar structural elements across forms that are functionally diverse. We may find the same structure in many different types of animals, but these structures are modified to perform different functions. These structures are developmentally related and are derived from a common ancestor. They may not be superficially or functionally similar. Jointed/paired appendages are homologous. The mouth, lophophore, trochophore larvae develop from the blastosphere. They have a common origin point but functionally as well as superficially they are different. Individually if we observe each trait in each phyla we find that the same structure is used in different ways by each phyla.

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