Cladogram

week_13_cladogram_and_hiv_1 x

Name:________________________

PART I – Reading a Tree

http://www.wvup.edu/ecrisp/biolgeol397diversity.htm

Which of the organisms on this chart is most closely related to humans?

Which organisms have an amniotic egg?

Is the iguana more closely related to the alligator or the crow? Explain your answer. (You should review figure 10-14 from your text before you answer)

PART II – Create Your Own Evolutionary Tree: To make a tree, you must first look at the animals you are studying and establish characteristics that they share and ones that are unique to each group. For the animals on the table, indicate whether the characteristic is present or not. Based on that chart, create a tree like the one pictured above.

(note: you can either draw the tree directly on the assignment using a drawing tool, or draw the tree by hand and scan it into the assignment. If you use a scan or picture of the tree, you will need to insert the picture into this doc file – Turnitin will not accept an assignment that is entirely scanned)

Cells

Backbone

Legs

Hair

Opposable Thumbs

Slug

Catfish

Frog

Tiger

Human

Part III: The evolution of HIV

In the week 13 content, there were links to two short videos on the evolution of HIV. Using what you know about evolution and natural selection, and what you learned about HIV from those videos, answer the following questions. Be specific – the most common error on this part of the assignment is not being specific enough. Make sure ALL of your writing is in your own words.

How and why does HIV evolve within the environment of the person who has it? What is the impact of this evolution on treatment?

How are doctors treating patients whose HIV is evolving? Why does this strategy work?