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  • A Study On Down Syndrome Essay

    1269 Words  | 6 Pages

    caused by an extra or partial chromosome 21,which is called nondisjunction. Nondisjunction happens when chromosomes are distributed incorrectly during egg and sperm formation. Most body cells contain 23 pairs of chromosomes, 23 chromosomes from each parent, adding to 46 chromosomes. When you have an extra chromosome it adds to 47, causing down syndrome. When the egg meets the sperm to form a normal embryo, the embryo gets three copies of chromosome 21. After that the chromosome is copied to each cell as

  • Summary of Inheritance: Sex-Linked Traits and Meiosis

    772 Words  | 3 Pages

    varied gametes (eggs or sperm cells) out of a diploid cell." (Hartwell, 2006, p.1) The diploid cell contains a full set of chromosome pairs with each pair being inclusive of one chromosome from each parent. While the chromosome pairs are not identical in nature, they are homologous or equivalent chromosomes since they contain different gene alleles. I. The Process The chromosomes are replicated and each is reported to comprise "two identical chromatids" which are stated to be joined by a centromere

  • Describing Cell Division Essay

    802 Words  | 4 Pages

    undergo mitosis, copying the genetic information in the nucleus . A single chromosome copy is given to each of the daughter cells.Once DNA replication is completed there is a concise G2 phase dedicated to last-minute protein synthesis and completion of centriole replication. The cell will then enter the M phase (prophase, metaphase, anaphase and telophase) and the beginning of mitosis.During prophase the DNA changes to form chromosomes while for mitotic spindle made of proteins called micro-tubules begins

  • Haha

    631 Words  | 3 Pages

    division results in genetically identical daughter cells 3. What is the meaning of genome? Compare your genome to that of a prokaryotic cell. 4. How many chromosomes are in a human somatic cell? 5. Name two types of somatic cells in your body. 6. What is a gamete? 7. Name the two types of gametes. 8. How many chromosomes in a human gamete? 9. Define chromatin. You are going to have to learn the difference between a number of similar-sounding terms. The sketch that looks

  • The Four Stages Of The Cell Cycle

    750 Words  | 3 Pages

    First is prophase, in which chromosomes are condensed, homologous chromosomes are paired together, and the spindle apparatus made of microtubules forms. Second is metaphase, in which the paired chromosomes are lined up across the center of the cell on the metaphase plate. Third is anaphase, in which the homologous chromosomes are pulled to separate poles in the dividing cell by the attached spindle apparatus. Fourth one is the telophase, in which the daughter cell chromosomes are collected together at

  • Speech On Mitosis

    840 Words  | 4 Pages

    dictionary, is a process that takes place in the nucleus of a dividing cell. It involves a series of steps consisting of prophase, metaphase, anaphase and telophase. This results in the formation of two new nuclei each having the same number of chromosomes as the parent nucleus. Why is mitosis important? Mitosis is an essential part of the growth and development for all living things, from the smallest unicellular organisms like amoebas and bacteria to complex organisms like plants and animals

  • Discuss in Detail the Cell Cycle, Mitosis and Meiosis.

    1007 Words  | 5 Pages

    divisions of meiosis, a single cell will produce four cells each having the haploid number of chromosomes. Prophase I of meiosis begins with the condensation of chromosomes, and the vesiculation of the nuclear membrane. Centrosomes, which duplicate at the beginning of meiosis, begin moving apart and the spindle fibers begin forming. Early in prophase, synaptonemal complexes form and the homologous chromosomes are seen to align next to each other to form a structure called a bivalent. A bivalent is composed

  • History of the Patau Syndrome

    1850 Words  | 7 Pages

    Patau Syndrome, otherwise known as T13 is a very rare and lethal genetic disorder in which a person has three copies of chromosome 13 instead of two. T13 is characterized by the presence of an assortment of heart and brain malformation in newborns. Children with the disease are often born with multiple birth defects that are normally associated with T13 but not limited to it, including small eyes, undescended testicles, cleft lip/palate, and they consistently exhibit signs of mental deficiency and/or

  • Bio Quiz

    1397 Words  | 6 Pages

    Student Response Value A. crossing over during meiosis B. the number of chromosomes in the cell C. the number of genes for which different alleles are present D. random alignment of chromosomes during meiosis E. All of the above. 100% Score: 1/1   16.   A typical gene contains the instructions for making   Student Response Value A. a lipid. B. a protein. 100% C. a chromosome. D. a polysaccharide. E. All of the above are possible. Score: 1/1   17.  

  • Factors Affecting Human Development During Phases Of Meiosis And Mitosis

    2070 Words  | 9 Pages

    The process of nondisjunction can occur in human development during phases in meiosis and mitosis. The irregularity results in an abnormal amount of chromosomes in the produced cells and causes alterations in those who are affected. Nondisjunctional consequences can be seen in these five examples of genetic inheritance conditions discussed in this paper: Down syndrome, Patau’s syndrome, Edward’s syndrome, Klinefelter syndrome, and Turner’s syndrome. The Mendelian principles of genetics developed