The Universal Phylogenetic Tree (The Assessment Answer

Assignment Task -                 
 

Write a critical essay on “The quest for the universal phylogenetic tree (the Tree of Life)”. 

Include the following discussion points.

1. Define phylogenetic tree.

2.  Homology as a key theme in the course of evolution, though it is only one aspect of evolution. Contrast, in some details, horizontally acquired variations (also known as lateral gene transfer) and vertically generated variations (descent) which also contribute to evolution.

3. Briefly describe the episode of rapid complexification in evolution known as the Cambrian Explosion. Mention the duration, main events and which new groups of the organisms ( as new branches of phylogenetic tree) are involved in this episode?

4. Comparing extant (present day) species with the fossil records, we notice that some species have evolved significantly over time, while other species did not evolve as much.  Suggest some factors and briefly discuss any one factor with appropriate example which explains this observation.

5. Does the Tree of Life exist? Only write your own views and rationale as conclusion.

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