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  1. dominant allele
    an allele that produces the same phenotype whether its paired allele is identical or different
    The Nature of Alleles

    A dominant allele is an allele that is almost always expressed, even if only one copy is present.
  2. diploid
    an organism or cell having the normal amount of DNA per cell
    The term diploid describes a state in which a cell has two sets of homologous chromosomes, or two chromosomes that are the same.
  3. eukaryotic
    having cells with `good' or membrane-bound nuclei
    This theory is also supported by the existence of a eukaryotic organism, called the amoeba, which lacks mitochondria.
  4. centromere
    a specialized condensed region of each chromosome that appears during mitosis where the chromatids are held together to form an X shape
    The most highly repeated sequences found so far in mammals are called "satellite DNA" because their unusual composition allows them to be easily separated from other DNA. These sequences are associated with chromosome structure and are found at the centromeres (or centers) and telomeres (ends) of chromosomes.
  5. recessive allele
    an allele that produces its characteristic phenotype only when its paired allele is identical
    On the other hand, a recessive allele will be expressed only if there are two identical copies of that allele, or for a male, if one copy is present on the X chromosome.
  6. prokaryote
    a unicellular organism lacking a membrane-bound nucleus
    The location and base sequence of each promoter site vary for prokaryotes (bacteria) and eukaryotes (higher organisms), but they are both recognized by RNA polymerase, which can then grab hold of the sequence and drive the production of an mRNA.
Created on 十二月 1, 2009

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