Concept explainers
Describe likely features of the common ancestor of chordates, and explain your reasoning.
To explain: Likely features of common ancestor of chordates.
Concept introduction:
Deuterostomes are the likely ancestors of the Chordates. Deuterostomes consists of Echinoderms, Cephalochordates, Urochordates and many more phylums. They do not look physiologically like chordates but are genetically very similar.
Explanation of Solution
The features of the common ancestors of chordates are the presence of dorsal nerve cord and notochord. They possess pharyngeal slits that function as gills of fish. They also possess a muscular tail that surpasses the anus. The symmetry is bilateral as the cord passes through the center.
The modern-day chordate possess various features same as their ancestors. Presence of the nerve cord and muscular layering over it are seen in the ancestors, the features that are now fully developed in phylum Chordata.
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Chapter 34 Solutions
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- Name five characteristics shared by all chordates, and explain the primary function of eacharrow_forwardExplain the Evolutionary Trends Among the Chordates ?arrow_forwardList and explain the known features of Chordates Provide examples of chordates from various subphylums and superclassarrow_forward
- How does Anterior posterior axis gives chordate and higher non chordates a bilateral symmetryarrow_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 comparision of chordates and non chordates with examples?arrow_forward
- Diagram the evolutionary tree for chordates and indicate on the tree where major adaptations occurarrow_forwardList the four distinguishing chordate traits.arrow_forwardDescribe how paedomorphosis as a mechanism could explain the evolution of the chordate body plan (from echinoderm larval form to a craniate form).arrow_forward
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