chapter 34 learning objectives

chapter 34 learning objectives - Learning Objectives...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Learning Objectives Chapter 34: Vertebrates Concept 34.1: Chordates have a notochord and a dorsal, hollow nerve chord Describe the four derived traits that define the phylum Chordata o Notochord longitudinal, flexible rod located between the digestive tube and the nerve cord o Dorsal, Hollow Nerve Cord Nerve cord of a chordate embryo that develops from a plate of ectoderm Then rolls into a tube located dorsal to the notochord o Pharyngeal Slits or Clefts Pharyngeal Clefts- One of the grooves that separate a series of pouches along the sides of the pharynx May develop into a Pharyngeal Slit Pharyngeal Slits- One of the slits that form from the pharyngeal clefts and communicate to the outside Later develops into gills slits o Muscular, Post-Anal Tail Contains skeletal elements and muscles and helps propel many aquatic species in the water Distinguish among the three subphyla of the phylum Chordata and give examples of each o Cephalochordata Persistent notochord in the adult Large sac-like pharynx with gill slits for food collection and respiration Ex. Lancelets o Urochordata Chordate features (Ex. notochord and nerve chord) are only found in the larva Generally lost in the adult Adult secretes a tough cellulose sac in which the animal is embedded Ex. Tunicates o Craniata Possess a brain enclosed in a skull, ears, kidneys and other organs
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Well-formed bony or cartilaginous vertebral column or backbone enclosing the spinal cord Explain the significance of the tunicate larva in hypotheses of chordate evolution o A larval tunicate is completely different than an adult tunicate o As it develops, a tunicate loses most of its chordate characteristics and its organs move around as it changes Concept 34.2: Craniates are chordates that have a head List the derived characteristics of the craniates. o Two clusters of Hox genes Lancelets and tunicates have only one o Neural crest- A collection of cells that appears near the dorsal margins of the closing neural tube in an embryo Disperse through the body and give rise to a variety of structures Teeth, some bones and cartilage of the skull, the inner layer of skin of the facial region, several types of neurons, and the sensory
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

chapter 34 learning objectives - Learning Objectives...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online