Cladograms and Phylogenetic Trees

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