jaws to limbs #16

Question 1

Synapomopy

Answer 1

derived character shared by common ancestor & 2 or more descendant lineages

Question 2

What are the groups of invertebrate chordates & vertebrates with no backbone?

Answer 2

Echinodermata/Cephalochordata/ Urochordata
Hagfish/lamprey

Question 3

What are the 3 groups of jawed vertebrates?

Answer 3

Sharks (cartilage fish), ray-finned fish, tetrapods

Question 4

What are the groups of fish that tetrapods evolved from?

Answer 4

Bony fish = ray/ lobed finned fish

Question 5

What are the 3 groups of tetrapods?

Answer 5

Amphibians, reptiles, mammals (sister groups)

Question 6

What is the importance of Tiktualik and its tetrapod characters?

Answer 6

Same basic patterns as tetrapods
Neck, ribs, fin skeleton, flat skull, eyes on top of skull

Question 7

How did fins evolve into tetrapod limbs?

Answer 7

Bc tetrapods became very diverse it was necessary for terrestrial life

Question 8

What are the major characteristics of amphibians?

Answer 8

First group of tetrapods (salamanders, frogs,caecilians), semiaquatic