does synapsis of homologous chromosomes only happen in meiosis? Synapsis is the alignment of the genes on the chromatids of homologous chromosomes. Therefore‚ it only happens in meiosis because the haploid daughter cells each are given half of the parent cell’s DNA‚ unlike in mitosis‚ where each daughter cell is given an exact copy. What is the metaphase plate and what purpose does it serve? The metaphase plate is an imaginary plane within the cell‚ on which the chromosomes line up. Once they are lined
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Chapter 5: Skeletal FIBROUS joints form soft spots on a baby’s head. The nose is formed mostly of bone. – FALSE (cartilage) An immature bone cell found growing bone – OSTEOBLAST. An epiphyseal plate of cartilage forms at either end of a long and is the future growth plate may grow longer. –TRUE The Tibia of the lower leg forms the “shin bone”. –TRUE Ligaments connect the bone to bone at places called joints. –TRUE The lungs and heart are protected by the ribs‚ sternum‚ and
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INTRO Prader-Willi syndrome or PWS‚ is not a disease many people have knowledge about‚ or have even heard about it. Only about 1 in 25‚000 children are born with this rare syndrome. In 1956‚ Prader-Willi was first described by Andrea Prader‚ Heinrich Willi‚ and Alexis Labhart. Prader and Willi‚ both Swiss pediatricians‚ and Labhart‚ an internist‚ were the first people to publish a report on this syndrome (Nord‚ 2015). In the research‚ they described characteristics observed of the affected children
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also reproduce asexually through Mitosis and the purpose of it is to create an identical replica of a cell. B. Why is the cell cycle important for organisms? Mitosis duplicates the cells chromosomes by removing the original parent chromosomes and replacing them with newly replicated chromosomes in two exact copies of the
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Andres Schmidt Biology Period- I 05/21/13 Coffin-Lowry Syndrome (CLS) Coffin-Lowy Syndrome Definition: Coffin–Lowry syndrome is a genetic disorder that is X-linked dominant and which causes severe mental problems sometimes associated with abnormalities of growth‚ cardiac abnormalities‚ kyphoscoliosis‚ as well as auditory and visual abnormalities. Grange S. Coffin in 1966 discovered this syndrome‚ in the University of Columbia New York United States of America. Grange S. Coffin Grange
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the difference between haploid and diploid cells. Tell where in an organism they are found. Tell how they are produced. A haploid cell is a cell that contains one complete set of chromosomes. Gametes(sperm and ova) are haploid cells that are produced by meiosis. Diploid cells contain two complete sets (2n) of chromosomes. Diploid cells reproduce by mitosis making daughter cells that are exact replicas. Some examples are skin‚ blood‚ muscle cells (also known as somatic cells). 2. In 2-4 sentences
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1. 2. Basis of life are (a) nucleic acids (c) nucleoproteins Life span of parrot is (a) 140 years (c) 80 years Theory of ’saltations’ (b) proteins (d) amino acids (b) 60 years (d) 40 years was given by (c) Mixed (d) None of these 11. Pappus helps in dispersal of pollen in (a) Asteraceae (b) Brassicaceae (c) Malvaceae (d) Solanaceae 12. In which of the following groups are seeds present? (a) Psilophyta (c) Lycopodiophyta 13. Match the columns. Column I (Vitamins) A. B. C. D. B‚ D E C
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complete set of chromosomes. In humans‚ mitosis produces somatic cells that are diploid‚ which means they contain two non-identical copies of each of the twenty-three chromosomes. One copy is derived from the person’s mother and the other from the person’s father. Meiosis‚ on the other hand‚ occurs only in testis and ovary tissues‚ producing sperm and ova (eggs). The gametes that are produced by meiosis in humans are haploid‚ containing only one copy of each of the twenty-three chromosomes. Because of
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Sarah Haynes Dr. Christerson Honors Biology 9D 11 April 2015 10.1 Assessment 1a. Identify two reasons why a cell’s growth is limited. The larger a cell becomes‚ the more demands the cell places on its DNA. In addition‚ a large cell is less efficient in moving nutrients and waste material across the membrane. 1b. As a cell’s size increases‚ what happens to the ration of its surface area to its volume? As a cells size increases‚ the volume increases more than the surface area. However‚ the ratio
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independientemente de su tamaño ya que a través de ella puede mejorar su productividad y así generar mayores ganancias y elevar la rentabilidad de la compañía. Resulta sumamente necesario establecer metas claras que puedan ser entendidas por las personas para poder alcanzarlas‚ es por ello que vemos que día a día más empresas optan por este sistema de recompensas y establecimiento de metas para aumentar sus ingresos y ser más rentable. Lo vemos desde la tienda de autoservicio local hasta las empresas
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