BIOLOGY (LL)
5th Edition
ISBN: 9781264115495
Author: BROOKER
Publisher: MCG
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Chapter 20.2, Problem 1CC
Development in Animals I: Pattern Formation
Concept Check: What would you expect to be the
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Developmental Biology Question.
Look at the figure attatched and list two similarites and two differences between the group of cells on the top arrow and the group of cells on the bottom arrow. Brief explanations would be appreciated.
Fluorescence Mapping of Blastomere in Sea Urchins
Fate mapping is a technique that allows determination of the fate of cells from the three germ layers. In worms, the endoderm gives rise to the cells that line the intestines. The ectoderm gives rise to cells of the nervous system and body covering. The mesoderm gives rise to the muscles and other organs between the ectoderm and mesoderm. A researcher is tracing the fate of a particular cell (blastomere) from its position in one of the three germ layers of sea urchin blastulae by injecting a fluorescent tag in cells of the ectoderm, mesoderm, and endoderm. Several weeks later, the sea urchin embryos were analyzed for the presence of fluorescence in specific tissues. The following results were obtained.
Tissue
Percent increase fluorescence over background when dye is injected in the ectoderm
Percent increase fluorescence over background when dye is injected in the mesoderm
Percent increase fluorescence over background when dye is…
Chapter 20 Solutions
BIOLOGY (LL)
Ch. 20.1 - 20.1 General Themes in Development Concept Check:...Ch. 20.1 - Prob. 2CCCh. 20.1 - Prob. 1CSCh. 20.2 - Development in Animals I: Pattern Formation...Ch. 20.2 - Development in Animals I: Pattern Formation...Ch. 20.2 - Prob. 3CCCh. 20.2 - Core Skill: Modeling The goal of this modeling...Ch. 20.2 - Development in Animals I: Pattern Formation Core...Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.3 - Development in Animals II: Cell Differentiation...
Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.4 - Development in Plants Concept Check: Where are...Ch. 20.4 - Prob. 2CCCh. 20 - The process whereby a cells morphology and...Ch. 20 - Prob. 2TYCh. 20 - Positional information is important in determining...Ch. 20 - Morphogens are a. molecules that disrupt normal...Ch. 20 - Prob. 5TYCh. 20 - Arrange the following phases of pattern formation...Ch. 20 - Prob. 7TYCh. 20 - Which of the following genes do not play a role in...Ch. 20 - An embryonic stem cell that can give rise to any...Ch. 20 - Prob. 10TYCh. 20 - Prob. 1CQCh. 20 - The MyoD gene in mammals plays a role in muscle...Ch. 20 - Prob. 3CQCh. 20 - Prob. 1COQCh. 20 - Is it possible for a phenotypically normal female...
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- Discuss Concepts Arguably, in sexually reproducing animals, development begins when eggs and sperm form in the parents. In a paragraph, explain the rationale for this idea.arrow_forwardDiscuss Concepts Experimentally, it is possible to divide an amphibian egg so that the gray crescent is wholly within one of the two cells formed. If the two cells are separated, only the cell with the gray crescent will form an embryo with a long axis, notochord, nerve cord, and back musculature. The other forms a shapeless mass of immature gut and blood cells. Propose an explanation for these outcomes.arrow_forwardDiscuss Concepts Developmental biologist Lewis Wolpert once observed that it is not birth, marriage or death, but gastrulation which is truly the most important time in your life. In what sense is he correct?arrow_forward
- Match the following some are redundant please explain why?: Axis specification Pattern formation Genes encoding Nodal signnaling pathway members. Achondroplasia A gene which when present on th X chromosome due to a translocation cause 46, XX Differences in sex development. Organogenesis A family of genes which are found in 4 clusters of several related genes on the hiuman chromosomes . Genes which are found on the chromosomes in the same order as their expression pattern along with anterior-posterior axis in the early vertebrate embryo. HOX genes SOX9 SRY Cells moving and changing shape to form the alveoli of the developing lung Mutations in these genes can cause congenital heart defects PAX6 Establishing which cells will later become each of the different parts of the eye Establishing which cells in the early embryo will develop into the front or the back A condition caused by mutations in a gene encoding a FGF receptor Pax genesarrow_forwardNot syncing 7. Which of the following best explains the development of twins? a. In the case of both identical and fraternal twins, the placenta and chorion may be shared, but it is very rare for both the placenta and the amniotic sac to be shared. b. In the case of fraternal twins, each fetus usually has its own placenta, chorion, and amniotic sac. Identical twins may each have their own placenta, chorion, and amniotic sac. In some cases, they share the placenta and the chorion; it is very rare for both the placenta and amniotic sac to be shared. c. In the case of both identical and fraternal twins, each twin has its own placenta, chorion, nd amniotic sac. d. In the case of fraternal twins, each fetus usually has its own placenta, chorion, and amniotic sac. Identical twins share the placenta and the chorion, and sometimes the amniotic sac. 田arrow_forwardPlease draw if needed .... show your workarrow_forward
- Reflect on the understandings of the mechanisms by which cells are able to govern embryonic development. Specifically, what was your current understanding or speculations regarding the molecular mechanisms by which cells are able to: 1. Control their proliferation 2. Transition into different types of cells 3. Move 4. Shape developing tissuesarrow_forward11arrow_forwardUsing Figure 22.6, indicate the stage at which segmentation genes, homeotic genes, and egg-polarity genes would have an effect on development.arrow_forward
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