Biology - Study Guide
8th Edition
ISBN: 9780321501561
Author: Martha R. Taylor
Publisher: PEARSON EDUCATION (COLLEGE)
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Chapter 47, Problem 8TYK
Summary Introduction
Introduction: The movement of cells into the blastula produces a two or three-layered embryo, which is called gastrula. The embryonic germ layers produced by the process of gastrulation are outer ectoderm and inner endoderm. The bilateral animals have a middle germ layer also, which is known as mesoderm.
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Observation of the development of embryos in sea stars shows the mesoderm forming pouches bulging from the archenteron to form the coelom. From this observation, you can predict that
A.
the cleavage of the embryo is radial.
B.
the adult animal will have bilateral symmetry.
C.
the mouth forms from the first opening in the gastrula.
D.
the animal is diploblastic.
What is NOT true about embryo development?
A. a morula is an earlier stage than a gastrula
B. Gatrulation creates endoderm and ectoderm in most animals
C. Mammal blastulas are called blastocysts due to the thickened area where the embryo develops
D. diploblastic animals have mesoderm
The evolution of the three germ layers ( ectoderm, mesoderm, endoderm) in the evolution of complex animals is associated with the Annelids ( Earth worm), the mollusk (clam), and the Cordata (the vertebrates) which are examples of? A) Protostomes and Deuterostomes B) Just the protostomes C) Only the Deuterostomes D) Cnideria E) Proifera
Explain why
Chapter 47 Solutions
Biology - Study Guide
Ch. 47 - a. What assures that only a sperm of the correct...Ch. 47 - Prob. 2IQCh. 47 - Prob. 3IQCh. 47 - Prob. 4IQCh. 47 - Label the indicated structures in the following...Ch. 47 - Prob. 6IQCh. 47 - Prob. 7IQCh. 47 - Prob. 1SYKCh. 47 - Fill in the following table, briefly describing...Ch. 47 - Prob. 1TYK
Ch. 47 - Prob. 2TYKCh. 47 - The blastocoel a. develops into the archenteron or...Ch. 47 - In a frog embryo, gastrulation a. is slowed by the...Ch. 47 - Prob. 5TYKCh. 47 - Prob. 6TYKCh. 47 - Prob. 7TYKCh. 47 - Prob. 8TYKCh. 47 - To which portion of the developing embryo do cells...Ch. 47 - Prob. 10TYKCh. 47 - Prob. 11TYKCh. 47 - Prob. 12TYKCh. 47 - Use the following diagram of a chick embryo for...Ch. 47 - During gastrulation in the frog embryo, a new...Ch. 47 - Gastrulation and organogenesis in mammals most...Ch. 47 - Prob. 16TYKCh. 47 - Prob. 17TYKCh. 47 - Prob. 18TYKCh. 47 - Prob. 19TYKCh. 47 - Prob. 20TYK
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- Which of the following are mismatched? (a) endoderm; lining of the digestive tube (b) ectoderm; circulatory system (c) mesoderm; notochord (d) mesoderm; reproductive system (e) ectoderm; sense organsarrow_forwardAn unidentified substance (or substances) released from the developing notochord causes the overlying ectoderm to form the neural plate. This phenomenon is known as (a) activation (b) determination (c) induction (d) implantation (e) mosaic developmentarrow_forwardAlong the notochord, segmented blocks of tissue that give rise to muscles, vertebrae, and connective tissues are calleda. neural crests.b. morulas.c. primitive streaks.d. somitesarrow_forward
- The ribs form from the ________. a. notochord b. neural plate c. neural tube d. somitesarrow_forwardWhat is a potential result of injecting notochord tissue into the ventral (bottom) region of the mesoderm of a frog embryo. Group of answer choices A. a tadpole with no dorsal surface B. a tadpole with reversed legs C. a tadpole that never becomes an adult D. a tadpole with two spinal cords and brainsarrow_forwardFrom which of the following is the embryo developed? a) Trophoblasts b) Blastocoelen c) The yellow sacks d) Inner cell massarrow_forward
- In Deuterostomes, nutrient molecules (monomers) are taken in to the space between the endoderm and the ectoderm because... A) The ectoderm makes protein for movement B) The endoderm cells release hydrolytic enzymes that act on polymers C) The endoderm releases enzymes that conduct dehydration synthesis of proteins D) mRNA polymerase causes hydrolysis of DNA E) All are correct Explain whyarrow_forwardThe cnidaria, jelly fish, are the first organisms to exhibit? a) an ectoderm layer b) endoderm layer with digestive cells that release enzymes in to a digestive structure c) ectoderm cells that specialize to become cells which react to a stimulus and produce movement d) a water-based internal environment (prebiotic ocean) between the ectoderm and the endoderm e) all are true for cnidariaarrow_forwardAt which of the following stages of development is a frog embryo composed of the most cells? Group of answer choices A. blastula B. neural tube stage C. gastrula D. zygote (fertilized egg)arrow_forward
- Which of the following organisms would NOT undergo gastrulation? a. fungi and sponges b. worms and snails c. nematodes d. those with only one opening for food and waste (protostomes)arrow_forwardWhich of the following is not true about avian eggs? Choose all possible answers. a. exhibit holoblastic cleavage b. first cleavages are perpendicular to the plane of the blastodisc, and approximately at right angles to one another c. at the time of the fourth cleavage, a furrow running parallel to the circumference of the blastodisc separates central from peripheral forming blastomeres. d. portion of the undersurface of the blastoderm that is farthest from the source of gravity becomes the anterior end of the embryo. e. All of the following are true about eggs of frogs.arrow_forwardWhat structural adaptation in chickens allows them to lay theireggs in arid environments rather than in water?(A) extraembryonic membranes(B) yolk(C) cleavage(D) gastrulationarrow_forward
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