Is a hippopotamus more closely related to a pig or to a whale?

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Presentation transcript:

Is a hippopotamus more closely related to a pig or to a whale?

HIPPO WHALE

Evolutionary Link Whales and hippos had a common water-loving ancestor 50 to 60 million years ago that evolved and split into two groups: The cetaceans (whales, dolphins, and porpoises) The pig-like anthracotheres – died out less than 2.5 million years ago, leaving only the hippo as a descendent

Cladogram

Cladograms are used to… Organize organisms based on evolutionary relationships (phylogeny). In other words…who is related to who and where did we come from…

How are cladograms constructed? Organisms are grouped together based on their shared derived characteristics.

Cladogram construction Given a table of derived characters, create a cladogram

Step 1 – Create a Venn Diagram How many organisms are you comparing? This number will equal the number of circles in your Venn diagram. Now count the number of characters each organism has. This will be the order that you place the organisms in the Venn Diagram.

Venn Diagram Placenta: Human Mammary glands: Kangaroo Two pairs of limbs: Bullfrog Vertebrae: Shark

Step Two – Convert the Venn Diagram into a Cladogram Kangaroo Bullfrog Human Shark Placenta Mammary Glands Two pairs of limbs Vertebrae

Turn to your neighbor and discuss your understanding of cladograms.