Loose Leaf For Integrated Principles Of Zoology
18th Edition
ISBN: 9781260411140
Author: Cleveland P Hickman Jr. Emeritus, Susan L. Keen, David J Eisenhour Professor PhD, Allan Larson, Helen I'Anson Associate Professor of Biology
Publisher: McGraw-Hill Education
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Chapter 8, Problem 11RQ
Describe two different experimental approaches that provide evidence for nuclear equivalence in animal embryos.
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Describe the two different experimental approaches that give evidence for nuclear equivalence in the embryos of animals.
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In animal reproductive cloning, diploid nucleus of a somatic animal cells is introduced instead of the egg nucleus, after several days of growth the embryo is implanted in the uterus of surrogate mother.
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Chapter 8 Solutions
Loose Leaf For Integrated Principles Of Zoology
Ch. 8 - What is meant by epigenesis? How did Kaspar...Ch. 8 - How is an egg (oocyte) prepared during oogenesis...Ch. 8 - Describe events that follow contact of a...Ch. 8 - What is meant by the term activation in...Ch. 8 - How does amount of yolk affect cleavage? Compare...Ch. 8 - What is the difference between radial and spiral...Ch. 8 - What other developmental hallmarks are often...Ch. 8 - What is indirect development?Ch. 8 - Using sea star embryos as an example, describe...Ch. 8 - What is the difference between schizocoelous and...
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- Draw a whitefish blastula cell in interphase (400x)?arrow_forwardIn recent years, techniques have been developed to clone mammals through a process called nuclear transfer, in which the nucleus of a somatic cell is transferred to an egg cell from which the nuclear material has been removed . Research has demonstrated that when a nucleus from a differentiated somatic cell is transferred to an eggcell, only a small percentage of the resulting embryos complete development, and many of those that do die shortly after birth. In contrast, when a nucleus from an undifferentiated embryonic stem cell is transferred to an egg cell, the percentage of embryos that complete development is significantly higher (W. M. Rideout, K. Eggan, and R. Jaenisch. 2001. Science 293:1095–1098). Propose a possible reason for why a higher percentage of cloned embryos develop successfully when the nucleus transferred comes from an undifferentiated embryonic stem cell.arrow_forwardDraw a whitefish blastula cell in metaphase (400x)?arrow_forward
- 3) At the completion of meiosis, how many sets of chromosomes does each daughter cell contain? 1 2 3 4 4) Imagine that a cell within a tissue is expressing a protein that leaves the cell and can “signal” to other cells. Which cells will respond? A) Cells that are within range of the signaling molecule and have protein receptor that binds the signaling molecule B) Cells that are within range of the signaling molecule C) Cells that are within range of the signaling molecule and are expressing their own signaling molecules D) Cells that are within range of the signaling molecule and are the same type of cellarrow_forwardSuppose the diagram below shows a cell during metaphase Meiosis II: microtubule a) Label the elements of the figure. b) Assuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes a cell from this organism have immediately after fertilization? Tne left Showarrow_forwardA C. elegans (nematode) gene called par-1 helps todetermine the AP axis of the animal early in development. Scientists determined that par-1 is pleiotropic—it also has a later function in forming the vulva of theadult animal. How could researchers circumvent thelethality of par-1− mutants to observe the later function of the par-1 gene? (Hint: C. elegans larvae caneat bacteria expressing RNAi for any gene.)arrow_forward
- In the late 1980s, this gradient hypothesis was united with a genetic approach to the study of Drosophila embryogenesis. If there were gradients, what were the morphogens whose concentrations changed over space?arrow_forwardExperiment: Saccharomyces cerevisiae can exist stably in either a haploid or a diploid state. A haploid S. cerevisiae cell has 16 chromosomes. When certain haploids come into contact, they fuse their cell walls and membranes, followed by the fusion of their nuclear membranes. The single nucleus now has 32 chromosomes, 16 from each parent strain, and is thus a diploid. Haploid yeast strains divide mitotically to give rise to haploid progeny, and diploid strains divide mitotically to give rise to diploid progeny. Certain haploids can fuse to form diploids. Haploid S. cerevisiae exists in two "mating types," called a and a. Mating occurs only between a and a cells; no mating occurs between cells of identical mating type. We have a collection of eight a haploid mutant strains and eight a haploid mutant strains of yeast unable to synthesize tryptophan (trp). These will be combined (mated) in all possible combinations to yield diploid strains. If the diploids can grow on minimal medium,…arrow_forwardWhat would be genotypes of daughter cells if the mother cell has genotype AaBBCc (all genes are located on different chromosomes) after a) meiotic division b) mitotic divisionarrow_forward
- Early C. elegans embryos display mosaic determination, whereas early mouse embryos exhibit regulativedetermination. Predict the results you would expect ifthe following treatments were performed on four-cellembryos of each of these two species (assuming thesemanipulations could actually be performed):a. A laser is used to destroy one of the four cells (thistechnique is called laser ablation).b. The four cells of the embryo are separated fromeach other and allowed to develop.c. The cells from two different four-celled embryosare joined together to make an eight-celledembryo.arrow_forwardDescribe genetic studies which showed that yeastmitochondria are inherited biparentallyarrow_forwardWhich 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_forward
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