Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 49, Problem 6TYK
Summary Introduction
Introduction:
Sexual reproduction results in the birth of an offspring, which depends upon the contribution of both parents. After the egg has been fertilized by the sperm; the parent body provides nutrition to the developing embryo. Nutrition to the developing embryo depends upon the reproduction system of the parent, which includes viviparity, oviparity, and viviparity.
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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 outermost germ layer in a vertebrate gastrula is the____ . a. endoderm c. mesoderm b. ectoderm d. dermis
Chapter 49 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 49.1 - Prob. 1SBCh. 49.2 - What are egg coats, and what is their function?...Ch. 49.2 - Prob. 2SBCh. 49.3 - Outline the roles of follicle-stimulating hormone...Ch. 49.4 - How does the oral contraceptive pill prevent...Ch. 49 - Prob. 1TYKCh. 49 - Which of the following processes does not increase...Ch. 49 - Prob. 3TYKCh. 49 - Prob. 4TYKCh. 49 - The slow block to polyspermy: a. is caused by a...
Ch. 49 - Prob. 6TYKCh. 49 - Prob. 7TYKCh. 49 - Prob. 8TYKCh. 49 - Prob. 9TYKCh. 49 - Prob. 10TYKCh. 49 - Prob. 11TYKCh. 49 - Prob. 12TYKCh. 49 - Prob. 13TYKCh. 49 - Prob. 14TYKCh. 49 - Prob. 15TYKCh. 49 - Prob. 16TYKCh. 49 - Prob. 17TYKCh. 49 - Prob. 18TYKCh. 49 - Prob. 1ITDCh. 49 - Prob. 2ITDCh. 49 - Prob. 3ITD
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- Endoderm, Mesoderm, and Ectoderm are formed during ________. a. Gametogenesis b. Cleavage c. Gastrulation d. Organogenesisarrow_forwardWhich statement is true of Spemann’s organizer?a. It is unique to amphibian embryos.b. It arises early in cleavage-stage embryos.c. It secretes morphogens, including the protein called noggin.d. It is found in the dorsal lip region of early gastrula-stageembryos.e. Both c and d are true of Spemann’s organizer.arrow_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_forward
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- The inner cell mass of a human blastocysta. gives rise to the chorion.b. gives rise to the placenta.c. gives rise to the embryo.d. consists of highly differentiated cells.arrow_forwardWhich of the following is a true statement?(A) All mammals have menstrual cycles.(B) The endometrial lining is shed in menstrual cycles butreabsorbed in estrous cycles.(C) Estrous cycles are more frequent than menstrual cycles.(D) Ovulation occurs before the endometrium thickens inestrous cycles.arrow_forwardInternal and external fertilization differ in that species thata. produce an amniotic egg have internal fertilization.b. without an amniotic egg have external fertilization.c. produce live young have mammary glands.d. lay eggs are external fertilizersarrow_forward
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