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 compare and contrast mitosis and meiosis including the steps‚ purpose and products. Mitosis and meiosis are types of nuclear division that make different types of cells. Mitosis
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Question 1 2 out of 2 points Which of the following statements about meiosis is true? Selected Answer: a. The chromosome number in the resulting cells is halved. Question 2 2 out of 2 points The mitotic spindle Selected Answer: e. is composed of two different types of microtubules. Question 3 2 out of 2 points A chromatid is Selected Answer: e. one-half of a newly replicated eukaryotic chromosome. Question 4 2
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alteration causes this syndrome (deletion‚ inversion‚ etc.)? Explain how it happens during the process of meiosis. Williams Syndrome is caused by a deletion of genes in the Williams-Beuren region of chromosome 7; when deletions occur during the formation of the egg and sperm‚ it is caused by unequal recombination during meiosis. Recombination normally occurs between pairs of chromosomes during meiosis while they are lined up at the metaphase plate. If the pairs of chromosomes don’t line up correctly‚
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that store all the information that the body inbeds such as how one looks and functions. This paper will first describe the structure of DNA; second discuss how the structure of DNA allows it to serve as the basis for inheritance‚ third examine how meiosis allows DNA to be divided into gametes and finally‚ describe how this relates to Gregor Mendel’s patterns of inheritance. The structure of DNA DNA is a thread formed by two strands‚ related together to form a Double Helix. The Double Helix looks
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drawings to illustrate the different phases of mitosis in an animal cell with two chromosomes. (20) Answer Question 11.6: Tabulate the key differences between mitosis and meiosis. (14) Answer: Mitosis Meiosis DNA replication occurs during DNA replication occurs during interphase before mitosis begins interphase before meiosis 1 begins One division Two divisions Synapsis does not occur Synapsis occurs during prophase 1 Two daughter cells‚ each 2n and Four haploid cells‚ each containing half
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Unit 2 Lecture Study Guide – 1) What are the parts of an atom? Where are the subatomic particles found? a) Protons‚ neutrons‚ and electrons b) Protons and neutrons are located in the center of an atom in the nucleus and the electrons are located around the nucleus. 2) How does the Atomic Mass # differ from the Atomic #? The atomic mass number is the sum of the number of protons and neutrons in the nucleus of an element and the atomic number is the number of protons that it has. 3)
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Chapter 12 (Part 2) Explain the principle of independent assortment and its relation to meiosis: The segregation of chromosomes in anaphase I of meiosis explains Mendel’s observation that each parent gives one allele for each trait at random to each offspring‚ regardless of whether the allele is expressed. The segregation of chromosomes at random during anaphase I explains Mendel’s observation that factors‚ or genes‚ for different traits are inherited independently of each other. Apply the
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March 2017 Natural Selection Explanation A species is a group of individuals that produces fertile offspring. A population is a group of the same organisms or species. The main source of genetic variation is meiosis. Within meiosis‚ fertilization occurs and creates variation. Within meiosis‚ although it is rare‚ mutations happen which can be also a source of variation. Gene flow‚ the movement of genes within multiple populations is another source of variation as well. Variation plays the role of
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Mitosis and meiosis are the two major processes by which eukaryotic cells reproduce. Compare and contrast the processes of mitosis and meiosis. Consider the stages involved in each and their eventual products. How are the differences biologically significant relative to growth and reproduction? Be prepared to discuss how life is dependent upon both types of cellular reproduction. Mitosis is equal division of a cell and Meiosis is specialized type of cell division of chromosomes within a cell
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Down Syndrome is a chromosomal condition related to chromosome 21. It affects 1 in 800 to 1 in 1000 born infants. People who have Down Syndrome have learning difficulties‚ mental retardation‚ a different facial appearance‚ and poor muscle tone (hypotonia) in infancy. Individuals with Down Syndrome also have an increased risk for having heart defects‚ digestive problems such as “gastroesophageal reflux or celiac disease”‚ and hearing loss. Some people who have Down Syndrome have “low activity of
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