Derived Traits of Chordates

Question 1

Derived traits at Deuterostomia

Answer 1

Genetic similarities and two phyla: echinodermata and chordata

Question 2

Derived traits at Chordates

Answer 2

Notochord, dorsal hollow nerve chord, pharyngeal gill slits, muscular post-anal tail

Question 3

Derived traits at Vertebrates

Answer 3

Backbone composed of vertebrae and two clusters of hox genes

Question 4

Derived traits at Gnathostomes

Answer 4

Hinged jaws, bony skeleton, four clusters of Hox

Question 5

Derived traits at Osteichthyans

Answer 5

Lung-like swim bladder, bony fishes

Question 6

Derived traits at Lobe-fins

Answer 6

Muscular, lungs, gills

Question 7

Derived traits at Tetrapods

Answer 7

Limbs with toes, pelvic girdle, neck

Question 8

Derived traits at Amniotes

Answer 8

Amniotic egg, amnion, terrestrial, rib cage ventilation

Question 9

Derived traits at Mammalia

Answer 9

Mammary glands, endotherms, live young