LESSON REVIEW1) Identify: What are two types of evidence that suggest that evolution has occured?2) Apply: What is the significance of the similar number and arragement of bones in a human arm and a bat wing?3) What is a common ancestor?4) Imagine: If you were a scientist examining the DNA sequence of two unknown organisms that you hypothesize

share a common ancestor, what evidence would you expect to find?

In 1861 a major discovery was made in Germany: an incredible fossilized clue for evolution theories. This could be the ancestor of all living birds. Paleonthologist called it Archaeopteryx lithographica and according to their calculations it lived 150 million years ago. Specialists in the field postulate it as an example of a “transitional form” between two vertebrate groups.

5) What groups were specialists reffering to?6) Research: what characteristics does Archaeopteryx sp. share with living birds? which traits with the the predecessor taxon?7) Why can´t we find transitional forms in other groups?

The following diagram shows the canid family tree including the dog, the wolf and the jackal. It was buildt using DNA´s sequences from all these species.

8) Which species is more closely related to the jackal, the coyote or the hyena?9) Which species is the closest to dogs?