Phylogenetics

In a phylogenetic tree, the branching points represent common ancestors.

• Yes

• NO

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

What is the common ancestor of Letters A, B, C, D, E?

• 1

• 2

• 3

• 4

Who is most closely related to Taxidea taxus?

• Lutra lutra

• Panthera pardus

• Canis latrans

• Canis lupus

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

• Fish

• Frog

• Salamander

• Human

Which group of animals on this tree are most closely related to birds?

• Saurischian dinosaurs

• Ornithischian dinosaurs

• Crocodiles

• None of these are related to birds

What number is the common ancestor of C and D

• 1

• 2

• 3

• 4

What is the common ancestor of Letters A, B, C, D, E?

• 1

• 2

• 3

• 4

Who is the closest relative to the brown bear?

• Giant panda

• Dog

• Lesser panda

• Sun bear

The diagram below represents possible genetic relationships between groups of organisms.

Which statement is a valid conclusion that can be drawn from the diagram?

• Insects are more complex than mammals.

• Earthworms and sea stars have a common ancestor.

• Snails appeared on Earth before corals.

• Sponges were the last new species to appear on Earth.