Embryonic Development in Animals
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Questions and Answers

What is the process called when the zygote undergoes rapid cell division without cell growth?

  • Cleavage (correct)
  • Metamorphosis
  • Gastrulation
  • Hox genes
  • What structure is formed after cleavage in the development of most animals?

  • Adult
  • Larva
  • Blastula (correct)
  • Gastrula
  • What is an immature individual that looks different from the adult animal called?

  • Metamorphosis
  • Larva (correct)
  • Gastrula
  • Hox gene
  • Which stage involves the major change of body form in becoming an adult capable of reproducing sexually?

    <p>Metamorphosis</p> Signup and view all the answers

    What regulates the development of body form in most animals?

    <p>Hox genes</p> Signup and view all the answers

    What characteristic of Hox genes allows them to produce a wide diversity of animal morphology?

    <p>Highly conserved over evolution</p> Signup and view all the answers

    What is the main characteristic that differentiates bilateral symmetry from radial symmetry?

    <p>The presence of a left and right side</p> Signup and view all the answers

    Which feature is specific to bilaterally symmetrical animals?

    <p>Development of a head</p> Signup and view all the answers

    How do the body parts of a radial animal, like a sea anemone, appear?

    <p>Radiate from the center</p> Signup and view all the answers

    What does cephalization refer to in bilaterally symmetrical animals?

    <p>Development of a head</p> Signup and view all the answers

    In which type of symmetry do animals have only one imaginary cut that divides them into mirror-image halves?

    <p>Bilateral symmetry</p> Signup and view all the answers

    What is the key difference between radial and bilateral animals regarding their body plan?

    <p>Symmetry pattern</p> Signup and view all the answers

    In vertebrates, the notochord is located ______.

    <p>Ventral to the nerve cord</p> Signup and view all the answers

    Which of the following is a characteristic of invertebrates?

    <p>Post-anal tail present</p> Signup and view all the answers

    Symmetry in invertebrates can be described as ______.

    <p>Radial</p> Signup and view all the answers

    Which statement describes a key difference between invertebrates and vertebrates?

    <p>True coelomate organization exclusive to vertebrates</p> Signup and view all the answers

    Metamerism can be considered a characteristic feature of ______.

    <p>Only chordates</p> Signup and view all the answers

    What divides the coelomate phyla into two grades?

    <p>Body plan differences</p> Signup and view all the answers

    Which phyla belong to the Protostomes group?

    <p>Mollusks, annelids, arthropods</p> Signup and view all the answers

    What do the differences between Protostomes and Deuterostomes focus on?

    <p>Cleavage pattern, coelom formation, blastopore fate</p> Signup and view all the answers

    In the animal kingdom, what distinguishes Vertebrates from Invertebrates?

    <p>Presence of vertebral column or backbone</p> Signup and view all the answers

    What major groups have all animals been divided into?

    <p>Invertebrates (Non-Chordates) and Vertebrates (Chordates)</p> Signup and view all the answers

    What feature differentiates Invertebrates from Vertebrates?

    <p>Possession of a vertebral column or backbone</p> Signup and view all the answers

    Which of the following is a characteristic of Vertebrates' nervous system?

    <p>Segmental nerve roots</p> Signup and view all the answers

    What is a characteristic of Lower Invertebrates' blood flow?

    <p>Blood flows anteriorly</p> Signup and view all the answers

    Which of the following is a characteristic of Higher Invertebrates' respiration?

    <p>Through gills or lungs</p> Signup and view all the answers

    What is a feature that distinguishes Vertebrates' reproduction from Invertebrates?

    <p>Sexual reproduction poor</p> Signup and view all the answers

    One way to distinguish between Vertebrates and Invertebrates is by their body temperature. What characterizes Vertebrates in this aspect?

    <p>Warm-bloodedness</p> Signup and view all the answers

    What is a key feature of the Blood Vascular System in Lower Invertebrates?

    <p>Absent</p> Signup and view all the answers

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