Concept explainers
To determine: The evidence of chordate characteristics in the human embryo.
Introduction: All humans, animals, and birds are chordates. A notochord, a dorsal hollow nerve cord, a postanal tail, and pharynx with slits are some of the common features shared by all the chordates at some stage of their development. Chordates are called so because of the presence of notochord, which provides the chordates skeletal support.
To determine: Whether several chordate organs perform the same functions in humans and amphioxus or not.
Introduction: All humans, animals, and birds are chordates. A notochord, a dorsal hollow nerve cord, a postanal tail, and pharynx with slits are some of the common features shared by all the chordates at some stage of their development. Chordates are called so because of the presence of notochord, which provides the chordates skeletal support.
To explain: The reason for persistence of chordate characteristics in humans.
Introduction: All humans, animals, and birds are chordates. A notochord, a dorsal hollow nerve cord, a postanal tail, and pharynx with slits are some of the common features shared by all the chordates at some stage of their development. Chordates are called so because of the presence of notochord, which provides the chordates skeletal support.
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Biology (MindTap Course List)
- Figure 29.3 Which of the following statements about common features of chordates is true? The dorsal hollow nerve cord is part of the chordate central nervous system. In vertebrate fishes, the pharyngeal slits become the gills. Humans are not chordates because humans do not have a tail. Vertebrates do not have a notochord at any point in their development; instead, they have a vertebral column.arrow_forwardDuring embryonic development, what features do we share with tunicates or lancelets?arrow_forwardFill in the blanks with synapomorphic, symplesiomorphic, or neither Mesoderm is a ___ feature of chordates, and a ___ feature of vertebrates, but mesectoderm (neural crest) is a ___ feature of chordates, and a __ feature of vertebratesarrow_forward
- During embryonic development, a neural crest would be found in all of the following chordates, except a. cephalochordates. b. reptiles. c. birds. d. mammals.arrow_forwardThere are two types of chordates the invertebrates and the vertebrates. How do invertebrate chordates differ from vertebrate chordates? (state in your own words and provide references if there are any)arrow_forwardDescribe the evolution of mammals, tracing their synapsid lineage from early amniote ancestors to true mammals. How would you distinguish pelycosaurs, early therapsids, cynodonts, and mammals?arrow_forward
- Amphioxus long has been of interest to zoologists searching for a vertebrate ancestor. Explain why amphioxus captured such interest and why it no longer is considered to resemble closely the direct ancestor of the vertebrates.arrow_forwardMammals belong to a group of amniotes known as synapsids. Three major lineages of mammals had emerged by the early Cretaceous period. In a tabulated form, compare these three lineages to illustrate their diversity in terms of: a. Embryonic developmen, b. How the young are fed and c. Period of gestationarrow_forwardHow does Anterior posterior axis gives chordate and higher non chordates a bilateral symmetryarrow_forward
- Only eight species of lobe-finned fishes are alive today, remnants of a group that flourished in the Devonian period of the Paleozoic era. What morphological characteristics distinguish lobe-finned fishes? What is the literal meaning of Sarcopterygii, the taxon comprising lobe-finned fishes and tetrapods?arrow_forwardWhich of the following list places the important evolutionary innovations in the correct order of appearance in the chordate phylogeny? a. Vertebrae - bony skeleton - notochord - jaws - internal nares - lobe fins b. Jaws - notochord - bony skeleton - vertebrae - lobe fins - internal nares c. Notochord - jaws - vertebrae - internal nares - lobe fins - bony skeleton d. Notochord - vertebrae - jaws - bony skeleton - lobe fins - internal naresarrow_forwardFigure 15.33 Which of the following statements about common features of chordates is true?a. The dorsal hollow nerve cord is part of the chordate central nervous system.b. In vertebrate fishes, the pharyngeal slits become the gills.c. Humans are not chordates because humans do not have a tail.d. Vertebrates do not have a notochord at any point in their development; instead, they have a vertebral column.arrow_forward
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