Embryonic Development in Animals

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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?

Metamorphosis Signup and view all the answers

What regulates the development of body form in most animals?

Hox genes Signup and view all the answers

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

Highly conserved over evolution Signup and view all the answers

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

The presence of a left and right side Signup and view all the answers

Which feature is specific to bilaterally symmetrical animals?

Development of a head Signup and view all the answers

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

Radiate from the center Signup and view all the answers

What does cephalization refer to in bilaterally symmetrical animals?

Development of a head 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?

Bilateral symmetry Signup and view all the answers

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

Symmetry pattern Signup and view all the answers

In vertebrates, the notochord is located ______.

Ventral to the nerve cord Signup and view all the answers

Which of the following is a characteristic of invertebrates?

Post-anal tail present Signup and view all the answers

Symmetry in invertebrates can be described as ______.

Radial Signup and view all the answers

Which statement describes a key difference between invertebrates and vertebrates?

True coelomate organization exclusive to vertebrates Signup and view all the answers

Metamerism can be considered a characteristic feature of ______.

Only chordates Signup and view all the answers

What divides the coelomate phyla into two grades?

Body plan differences Signup and view all the answers

Which phyla belong to the Protostomes group?

Mollusks, annelids, arthropods Signup and view all the answers

What do the differences between Protostomes and Deuterostomes focus on?

Cleavage pattern, coelom formation, blastopore fate Signup and view all the answers

In the animal kingdom, what distinguishes Vertebrates from Invertebrates?

Presence of vertebral column or backbone Signup and view all the answers

What major groups have all animals been divided into?

Invertebrates (Non-Chordates) and Vertebrates (Chordates) Signup and view all the answers

What feature differentiates Invertebrates from Vertebrates?

Possession of a vertebral column or backbone Signup and view all the answers

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

Segmental nerve roots Signup and view all the answers

What is a characteristic of Lower Invertebrates' blood flow?

Blood flows anteriorly Signup and view all the answers

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

Through gills or lungs Signup and view all the answers

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

Sexual reproduction poor 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?

Warm-bloodedness Signup and view all the answers

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

Absent Signup and view all the answers