process known as meiosis. III. I am currently a biology major at CSU-Pueblo looking to pursue a degree in wildlife biology. IV. During the process of meiosis‚ diploid cells split in half‚ forming four haploid cells‚ which each have a single set of chromosomes. These cells are called either gametes or sex cells. Female gametes are egg and male gametes are sperm. Two meiotic divisions occur known as meiosis I and meiosis II‚ and each one of these divisions have four stages‚ which are; prophase‚ metaphase
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Western Mindanao State University College of Science and Mathematics Zamboanga City Group No.: 02 Date Performed: April 21‚ 2014 Group Members: Date Submitted: April 25‚ 2014 Reales‚ Pharra Anthea O. Pendergat‚ Ellyssa Mae A. Pedroza‚ Rikko Jeremy C. Dinorog‚ Ivy Mae V. BIO 101 LABORATORY Activity No.: 4 Movements of Materials Across Membrane I. INTRODUCTION Many important reactions and processes in materials occur by the motion of atoms in the solid (transport)‚ which happens
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behaviour of chromosomes during meiosis leads to variation. In this report you must explain crossing over and independent assortment (P4). (Max 500 words) 1c Create a table comparing mitosis and meiosis (P2). Task 2 2 Carry out practical investigations to record stages of cell division in garlic / onion root tip cells (P3). Using photographs of your results identify at least 5 cells that are dividing and explain the stage these cell are in and the behaviour of the chromosomes.(P2 & M2)
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or too few chromosomes‚ which is known as aneuploidy. Embryos with aneuploidy may be born with conditions like Down syndrome or Trisomy 21. In other cases‚ aneuploidy results in a miscarriage. Preimplantation genetic screening can determine if an embryo has the correct number of chromosomes to develop into viable pregnancy and a healthy baby. Not only does PGS allow our physicians at our Louisiana fertility centers to be 99% certain that the embryo has the correct number of chromosomes‚ it also allows
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Taxol must affect… A. Formation of the mitotic spindle This answer is A‚ because the drug Taxol disrupts microtubule formation‚ without microtubule formation the mitotic spindle will not be able to form. 8.) Why do chromosomes coil during mitosis? B. To allow the chromosomes to move without becoming entangled and breaking This answer can be found in the book on page 229‚ Figure 12.3. 12.) Which of the following is true concerning cancer cells? E. When they stop dividing‚ they do so at random
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Fragile X syndrome‚ also called Martin-Bell syndrome‚ is a syndrome of X-linked mental retardation. In 1943‚ Martine and Bell described a pedigree of X-linked mental disability. Chris and Weesam were first to sight an unusual “maker X chromosome” with mental disability in 1969. It is also the most common known cause of autism. Autism is a brain development disorder that impairs social interaction and communication. It can also cause restricted and repetitive behavior. It all starts before
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IN BACTERIA. Eukaryotes have two or more chromosomes‚ prokaryotes such as bacteria possess a single chromosome composed of double-stranded DNA in a loop. DNA is located in the nucleoid of the cell and is not associated with protein A plasmid is an extra-chromosomal DNA molecule separate from the chromosomal DNA which is capable of replicating independently of the chromosomal DNA. Plasmids usually occur naturally in bacteria. A chromosome is an organized structure of DNA and protein
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enough DNA to reach from here to the sun and back‚ more than 300 times. How is all of that DNA packaged so tightly into chromosomes and squeezed into a tiny nucleus? The haploid human genome contains approximately 3 billion base pairs of DNA packaged into 23 chromosomes. Of course‚ most cells in the body (except for female ova and male sperm) are diploid‚ with 23 pairs of chromosomes. That makes a total of 6 billion base pairs of DNA per cell. Because each base pair is around 0.34 nanometers long
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and contrast sexual and asexual reproduction. 3. Distinguish between the terms: DNA‚ gene‚ chromosome‚ replicated chromosome‚ sister chromatid and centromere. 4. What are the two phases of the cell cycle? What are the three stages of interphase? 5. Mitosis is the division of the ______‚ while cytokinesis is the division of the ______. 6. Describe the appearance and the location of the chromosomes during the four stages of mitotic cell division‚ as pictured in Figure 8.7. 7. How is cytokinesis
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often referred to as trisomy 21 because the cells for chromosome 21 are trisomic‚ meaning an individual with Down syndrome would have 47 chromosomes in all of their body cells. Down syndrome is a genetic disorder‚ there are 3 different types of chromosomal changes which can lead to Down syndrome: complete trisomy 21‚ whereby the nondisjunction occurs during the formation of the egg or sperm cells meaning all body cells will have 47 chromosomes. This is the most common causality of Down syndrome‚ accounting
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