Teleost exoskeleton

Question 1

The vertebrate mineralised skeleton is known to have first emerged as an … that extensively covered the fossil … fish (ostracoderms)

Answer 1

exoskeleton, jawless

Question 2

This study determines the embryonic origin of … and … … of teleosts

Answer 2

scales, fin rays

Question 3

Demonstrates that the exoskeleton is … in origin

Answer 3

mesodermal

Question 4

… … cells fail to contribute to these tissues

Answer 4

neural crest - suggests no skeletogenic capability in fish so unlikely hypothesis