Biology
12th Edition
ISBN: 9781260494570
Author: Raven, Peter
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 52, Problem 5U
Summary Introduction
The process of organogenesis in vertebrates begins with the two features such as notochord and the hollow dorsal nerve cord. The neural tube is formed from ectoderm cells, and the rest of the body is developed by changes in the mesoderm. The notochord is also formed from mesoderm
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Somites
a. begin forming at the tail end of the embryo and then move forward in a wavelike fashion.
b. are derived from endoderm.
c. develop into only one type of tissue per somite.
d. may vary in number from one species to the next.
During gastrulation, cells from the _____ layer of the bilaminar germinal disc migrate and form the three primary germ layers. a. notochord b. hypoblast c. epiblast d. mesoblast
For pattern formation to occur, the cells in the developing embryo must
a. “know” their position in the embryo.
b. be determined during the earliest divisions.
c. differentiate as they are “born.”
d. must all be reprogrammed after each cell division.
Chapter 52 Solutions
Biology
Ch. 52.1 - Describe the events involved in fertilization.Ch. 52.1 - Prob. 2LOCh. 52.2 - Prob. 1LOCh. 52.2 - Prob. 2LOCh. 52.2 - Prob. 3LOCh. 52.3 - Prob. 1LOCh. 52.3 - Compare gastrulation in different animals.Ch. 52.3 - Name the extraembryonic membranes in amniotes.Ch. 52.4 - Prob. 1LOCh. 52.4 - Prob. 2LO
Ch. 52.4 - Prob. 3LOCh. 52.5 - Prob. 1LOCh. 52.5 - Explain the function of the organizer.Ch. 52.5 - Distinguish between primary and secondary...Ch. 52.6 - Describe the major developmental events in the...Ch. 52.6 - Explain the role of the placenta.Ch. 52.6 - Prob. 3LOCh. 52 - Data analysis Two different genes have mutant...Ch. 52 - Prob. 1IQCh. 52 - Prob. 1UCh. 52 - Which of the following plays the greatest role in...Ch. 52 - Gastrulation is a critical event during...Ch. 52 - Gastrulation in a mammal would be most similar to...Ch. 52 - Prob. 5UCh. 52 - Of the following processes, which occurs last? a....Ch. 52 - Which of the following would qualify as a...Ch. 52 - Prob. 1ACh. 52 - In the Spemann experiment, when the dorsal lip is...Ch. 52 - Suppose that a burst of electromagnetic radiation...Ch. 52 - Prob. 4ACh. 52 - Drug or alcohol exposure during which of the...Ch. 52 - Axis formation in amniotic embryos could be...Ch. 52 - Prob. 1SCh. 52 - You look up from your studying to see your dog,...Ch. 52 - Why doesnt a woman menstruate while she is...Ch. 52 - Spemann and Mangold were able to demonstrate that...
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- Internal 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_forwardelect one: A. Process 1 Which of the processes illustrated above represents fertilization? B. Process 2 Process 3 Process 4 Process 2 Zygote The Life Cycle of the Horse Embryo Process 1 Gametes Process 3 Reproductive organs Process 4arrow_forwardIf cells from the presumptive neural ectoderm of a frog gastrula are transplanted onto the surface of a second gastrula where skin would normally develop, the transplanted cells will still develop into tissues of the nervous system. This experiment shows that the transplanted cells areA. differentiated.B. totipotent.C. discontinuous.D. determined.E. endodermal.arrow_forward
- Which of the following is false? a. The endoderm, mesoderm, ectoderm are germ layers. b. The trophoblast is a germ layer. c. The inner cell mass is a source of embryonic stem cells. d. The blastula is often a hollow ball of cells.arrow_forwardWhich of the following plays the greatest role in determining how cytoplasmic division occurs during cleavage? a. Number of chromosomes b. Amount of yolk c. Orientation of the vegetal pole d. Sex of the zygotearrow_forwardGastrulation... A. Is a specialized form of cell division that partitions the cytoplasm of a fertilized egg B. Refers to the fusion of haploid gametes to give a diploid zygote C. Produces an embryo with either two or three distinct cell layers D. Is a developmental stage consisting of a cell layer surrounding a fluid-filled space E. None of the abovearrow_forward
- A. An embryo sac (ovule) contains eight haploid nuclei.B. Three nuclei become three synergids, 2 polar nuclei, 3 antipodal nuclei. A.If statement A is wrong and B is correct. B.If both statements are wrong. C.If both statements are correct. D.If statement A is correct and B is wrong.arrow_forwardWhich of the following statements relating to axis formation in chickens is FALSE? a. Henson's node secretes proteins that antagonize BMPs. b. The side of the epiblast facing the negative, basic albumin will become the ventral side of the embryo. c. Cells of the posterior marginal zone secrete Nodal to initiate the primitive streak. d. Water and sodium ions are transported from the albumin through the blastodisc cells and into the subgerminal space.arrow_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
- Observations of the developing chick embryo reveal that skeletal muscles develop from the transplanted somites even though motor neurons innervating those muscles arise from chick neural crest cells. Based on these observations, what is MOST likely true? A. Neural crest cells differentiate into somites. B. Neural crest cells fuse with developing somite cells. C. Neural crest cells develop from migrating somite cells. D. Neural crest cells send projections into developing somites.arrow_forwardWhich of the following statements about gastrulation is correct? A. During gastrulation, the contents of cell nuclei begin to vary so that they can start to perform different fucntions. B. During gastrulation, cells differentiate so that they can start to perform different functions. C. The formation of the endoderm, mesoderm, and ectoderm occurs after gastrulation. D. The formation of the endoderm, mesoderm, and ectoderm occurs before gastrulation.arrow_forwardWhich developmental stage is mismatched? a. second week—implantation b. third week—heart development begins c. fourth and fifth week—limb buds appear d. sixth through eighth week—all organ systems present e. None of these stages are mismatched.arrow_forward
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