Phylogenetic Trees and Cladograms

Multiple Choice

An illustration and a dichotomous key are given. What is the correct classification for this organism?

• Class Insecta
• Order Amblygygi
• Order Araneae
• Order Scorpiones

Multiple Choice

Cattle egrets forage (feed) in fields among cattle. The egret gets easy access to flying insects stirred up by the cattle, and the cattle don't care if they are there or not.

• mutualism
• commensalism
• competition
• parasitism

Multiple Choice

Two organisms that are closely related would have

• very similar DNA sequence
• exactly the same DNA sequences
• no proteins in common
• completely different DNA sequence

Multiple Choice

According to the cladogram, which of the following is NOT a derived characteristic?

• light bones

• Allosaurus

• down feathers

• 3-toed foot; wishbone

Multiple Choice

According to this phylogenetic tree, which creature is the least related out of all pictured?

• Fish

• Frog

• Salamander

• Human

Multiple Choice

Which two groups of organisms have the MOST genetic DIFFERENCES?

• rotifers and nematodes

• mollusks and annelids

• mollusks and arthropods

• echinoderms and chordates

Multiple Choice

The diagram shows a cladogram of six species based on amino acid similarities. Which two species are MOST CLOSELY related.

• I and II

• II and IV

• I and V

• V and VI

Breakout Rooms

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1. ​I recommend you work with your groups!

2. SHARE YOUR SCREEN and BE PREPARED TO CHAT.​

3. Go to your GoFormative account or click the link in the chat and access the following assignments:

4. Practice: Classification using Dichotomous Keys https://app.formative.com/formatives/6211763eb49ceda3fde44b0a

5. Cladogram Analysis https://app.formative.com/formatives/6211d090a4e0619dd3c1f453 

6. You will have today to work on this assignment in class - use your time wisely!

7. The Cladogram Analysis and Practice: Classification using Dichotomous Keys are due tomorrow by midight and CLOSES on Friday, March 4, 2022. 

8. Raise your hand if you need help!

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Big reminder

No live classes tomorrow - BUT these are your responsibilities:

• Check the OHS for announcements!

• The 4.07: Classification Test is due tomorrow and CLOSES Sunday!!!! Take that test tomorrow!!!

• All Class​ification work in USA Test Prep closes Sunday -

• Classification Checkpoint

• Classification Exit Tickets

• All missing teacher made assignments CLOSE Friday, March 4

• All OHS work CLOSES Friday, March 11.​