Development and Evolution

Question 1

Where are Hox genes found?

Answer 1

Found in most animals with exceptions in jellyfish and sponges.

Question 2

What do hot genes do?

Answer 2

Regulate basic development body plans in animals

Question 3

When were the first animals discovered?

Answer 3

Around 630 million years ago.

Question 4

When were vertebrates discovered around?

Answer 4

Around 520 million years ago.

Question 5

What did the first vertebrates look like?

Answer 5

Had a backbone, cartilaginous, jawless fish, lack of paired fins.

Question 6

What did the first fish look like?

Answer 6

Paired fins, jaw and bony skeleton, gill arch supports, calcium storage.

Question 7

What were the characteristics of amniotes?

Answer 7

(350 Ma)
-Produced shelled eggs
-Had lung extensions of the esophagus

Question 8

What were some characteristics of the first mammals?

Answer 8

(220 Ma)
-Earliest ones laid shells eggs
-Platypus, Echnidna lay eggs and humans have eggs inside