Bio 242 Exam 3: Chordates Correct 1oo%

What are Chordate general characteristics? - ANSWER Eucoelomate Bilateral Symmetry Deuterostomes Chordate functional homologies (4) - ANSWER Notochord Pharyngeal gill slits Dorsal, hollow, single nerve cord Post-anal tail Homology in chordates. A flexible rod running posteriorly from the head to the tail. It acts as an attachment site for muscles and a support structure that can bend. It consists of a large fluid-filled cells encased in a stiff connective tissue. Its present in primitive chordates but is replaced by bone in vertebrates. - ANSWER Notochord Homology in chordates. The posterieor of the mouth is the pharynx. In primitive chordates there are slits that open to outside. They allow water to leave digestive tract before the stomach/intestines. In invertebrates it functions in filter feeding. - ANSWER Pharyngeal gill slits Homology in chordates. It develops the brain and spinal cord of the CNS. - ANSWER A dorsal, hollow, single nerve cord. Homology in chordates. It is a tail of variable length that extends past the anus. It contains skeletal structures and muscles. It provides a major means of propulsion for some chordates. - ANSWER Post-anal tail Digestion in chordates - ANSWER Extracellular In chordates the body is separated by - ANSWER segmentation Circulatory System in Chordates - ANSWER Closed Respiratory System in Chordates - ANSWER Well-developed (gills and lungs) Nervous system in chordates - ANSWER Well-developed. Cephalization/brbain. Reproductive system in chordates - ANSWER Dioecious. Internal or external fertilization. (some groups are monoecious) Cleavage in chordates - ANSWER Radial cleavage. Ind