Biology
11th Edition
ISBN: 9781259188138
Author: Peter H Raven, George B Johnson Professor, Kenneth A. Mason Dr. Ph.D., Jonathan Losos Dr., Susan Singer
Publisher: McGraw-Hill Education
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Chapter 19, Problem 4A
Summary Introduction
Introduction:
Pattern formation is the determination of relative location of the cells in an organism’s body. It happens even before the cells become determined and differentiated.
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Chapter 19 Solutions
Biology
Ch. 19 - During development, cells become a. differentiated...Ch. 19 - Prob. 2UCh. 19 - Prob. 3UCh. 19 - Prob. 4UCh. 19 - Plant meristems a. are only present during...Ch. 19 - Prob. 6UCh. 19 - The process of nuclear reprogramming a. is a...Ch. 19 - What is the common theme in cell determination by...Ch. 19 - The process of reproductive cloning a. shows that...Ch. 19 - Prob. 3A
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- From what you know about embryonic development, do you think that a cell from the inner cell mass or one from the ectoderm has more developmental potential?arrow_forwardDuring development, cells become a. differentiated before they become determined. b. determined before they become differentiated. c. determined by the loss of genetic material. d. differentiated by the loss of genetic material.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
- What statement best describes the difference between "fate maps" and "specification"? If cells are transplanted from their normal region in an embryo to a different region in a recipient embryo, such cells will alter their fate, but not their specification. Cell fate map describes the allocation of cells to the germ layers, ectoderm, mesoderm, or endoderm, whereas specification describes the exact tissues that each cell will ultimately become. The fate map of an embryo does not change during development -- the fate map of an egg is the same as the fate map of a late blastula -- whereas the specification map of an embryo changes continually as the embryo's development proceeds. The fate map of a cell is determined by labelling that cell and following it during normal development, whereas the specification state of a cell is determined by culturing a cell in an artificial medium and observing what tissues form from it.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_forwardWhat four types of cellular processes must occur to enable a fertilized egg to develop into an adult multicellular animal? Briefly discuss the role of each process. C2. The arrangement of body axes of the discuss the role of each process.arrow_forward
- Which of the following statements is/are true? A. Spermatogenesis is an example of asymmetric cell division. B. The formation of a mature egg occurs through symmetric cell division. C. Spermatogenesis and oogenesis are both examples of asymmetric cell division. D. Spermatogenesis involves only symmetric cell division whereas oogenesis involves asymmetric cell division.arrow_forwardSomites 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.arrow_forwardWhich of the following does NOT happen in the germinal period? a. dividing mass of cells travels to the uterus b. developing organs can be affected by toxins passing through the placenta c. mass of cells form a hollow ball d. cells begin to differentiate.arrow_forward
- Which of the following best describes the concept of cell differentiation during the development of a multicellular organism? A. During development, all of the genes in the embryo's cells are expressed at first, but fewer and fewer are expressed as time proceeds. B. During development, different sets of genes are deleted from different cell types so that at the end of development, each cell has only the genes it needs. C. During development, different cells become specialized to have different phenotypes even though they all originated from the same cell. ..arrow_forwardThe major development of organ systems takes place ina. weeks 1 and 2 of development.b. weeks 3–8 of development.c. weeks 8–20 of development.d. the last 30 weeks of development.arrow_forwardVirtually all steps of embryological development depend on: a. Alterations in the genome b. Tumor Stem Cells c. Changes in programs of gene expression d. Telomerasearrow_forward
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