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  • chromosome abnormality

    1152 Words  | 5 Pages

    born with two sets of chromosomes. 23 chromosomes are from the mother and 23 chromosomes from the father, creating a total of 46 chromosomes for the child. But for some children born today, they are born with chromosome abnormalities. Chromosome abnormalities involve sex chromosomes and are gender specific (O’Neil). With today’s technology and past studies, we are able to determine chromosome abnormalities and the syndromes that are formed by these abnormalities. Chromosome abnormalities happen

  • Chromosome replication

    525 Words  | 3 Pages

    eukaryotic chromosome duplication describes a highly coordinated process by which temporally regulated replicon clusters are sequentially activated and subsequently united to form two semi-conserved copies of the genome. Replicon clusters, or replication domains, are comprised of individual replication units that are synchronously activated at predetermined points during S phase. Bi-directional replication within each replicon is initiated at periodic AT-rich origins along each chromosome. Origins

  • Sex Chromosomes

    1709 Words  | 7 Pages

    The mechanisms responsible for the origin and maintenance of large non-recombining regions on sex chromosomes have been mostly studied in plants and animals, but the recent discovery of similar features on the fungal chromosomes carrying mating type genes in several species may shed new light on this phenomenon (Fraser et al. 2004). Sex chromosomes in plants and animals have evolved from an autosomal pair by the expansion of the non-recombining region around complementary genes determining sex-specific

  • Understanding the Y Chromosome

    2891 Words  | 12 Pages

    Y chromosome, the smallest chromosome of the karyotpe, is one of the two sex chromosomes. In 1905, Nettie Stevens identified that Y chromosome is a sex-determining chromosome, while conducting one study of the mealworm Tenebrio molitor. He also proposed that chromosomes always existed in pairs. In 1890 Hermann Henking discovered that Y chromosome was the pair of the X chromosome. All chromosomes normally appear to take on a well defined shape during mitosis when seen under microscope. This shape

  • Chromosomes and Life Cycles

    1124 Words  | 5 Pages

    Chromosomes and Life Cycles Chromosome Structure All cells contain a nucleus that has a membrane around it. Inside the nucleus are chromosomes. The chromosomes are made from a molecule called deoxyribonucleic acid - which is commonly known as DNA. DNA is a very long molecule, so long in fact that the DNA from just one person is long enough to stretch all the way to the moon. Reading this it would be hard to understand how DNA could fit into our cells, but this problem is overcome due

  • The Morals of Silencing Chromosomes

    1260 Words  | 6 Pages

    Chromosome silencing has led to a breakthrough in the world of Down syndrome, though it has proven to have multiple moral viewpoints that have come to be associated with it. Down syndrome is one of the most frequently occurring genetic disorders in the human population. Statistically, the chance of delivering a child with Down syndrome rises as the mother grows older. “Researchers now realize that older mothers have more babies with DS because the frequency of meiotic nondisjunction increases in

  • The Path to the Chromosome Theory of Heredity

    2617 Words  | 11 Pages

    The Path to the Chromosome Theory of Heredity The notion of the chromosome theory of heredity is very important to the understanding of evolution and genetics. There were many ideas, some correct and others not, which influenced the revolutionary discovery of chromosomal heredity. The main stones in the path to the chromosomal theory are the pangenesis hypothesis, the germ-plasm theory, and Mendel’s Laws. Pangenesis Lamarck expressed the idea that by simply using or not using certain

  • Researching Uses for Chromosome Probes

    548 Words  | 3 Pages

    Researching Uses for Chromosome Probes Sensitive chromosome probes recently discovered by a University geneticist will make it easier to detect certain types of genetic and prenatal diseases, as well as being used to determine paternity and provide forensic evidence in criminal cases. Probes are short pieces of DNA which bind to, and actually pinpoint, particular sites on a chromosome. Because these new probes are actually repeated hundreds or thousands of time at a particular site, they are

  • The Chromosome Disorder Down Syndrome

    607 Words  | 3 Pages

    The Chromosome Disorder Down Syndrome Down syndrome is the most common and readily identifiable chromosomal condition associated with mental retardation. It is caused by a chromosomal abnormality: for some unexplained reason, an accident in cell development results in 47 instead of the usual 46 chromosomes. This extra chromosome changes the orderly development of the body and brain. In most cases, the diagnosis of Down syndrome is made according to results from a chromosome test administered shortly

  • The Structure of Chromosome and the Influence of Epigenetic Factors

    991 Words  | 4 Pages

    (Martins, 1999). The theory established chromosomes as the carriers of hereditary information (genes). It also implied that chromosomes (and not genes) undergo segregation and independent assortment as proposed by Gregor Johann Medel (1865-1866) in his Laws of Inheritance. A chromosome can contain more than one gene(s). Although the contemporary scholars were highly skeptical of this idea, Thomas Hunt Morgan (1915), showed linear arrangement of genes in chromosomes providing a convincing evidence for