Comparative Anatomy

Where is the alligator and T. rex's common ancestor?

• Point A

• Point B

• Point C

• Point D

Comparative anatomy is...

• The study of how organisms develop certain traits over time.

• The study of the differences and similarities between the anatomy of different organisms.

• The study of parts of an organism and their functions.

• The study of the differences between the male and female anatomy of the same species.

What is this an example of?

• vestigial structures
• embryology
• homologous structures
• fossil record

TRUE or FALSE - Birds and insects both have wings, the wings are structurally different so they are: HOMOLOGOUS

• False
• true

• both

• I cannot answer

The comparing of similarities and differences of body structures in form and function.

• Analogous Structures
• Common Ancestry
• Comparative Anatomy
• Fossil Record

Is a bird more closely related to a prosimian or to an amphibian?

• Birds are more closely related to prosimians because they have more in common.

• Birds are more closely related to amphibians because they have more in common.

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

The image shows part of the humerus bone in different genera of primates.

These structures are...

• Analogous

• Homologous

• Vestigial

Could birds and whales share a common ancestor

• No, because the species' structures perform different functions.

• Yes, because they both don't live on land.

• No, because the species don't look similar or the same.

• Yes, because the fin/wing of the species are structurally homologous.

If these primate humerus bones are shown

from RECENT----> OLDEST

And if these are HOMOLOGOUS structures

What happened to the humerus in various species over time

• It became smaller

• It became larger

• It became more complex