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Chromosomal Mutations: Aneuploidy definitions

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  • Chromosomal Mutation
    Alteration in chromosome structure or number, impacting genetic balance and potentially causing severe phenotypes.
  • Aneuploidy
    Condition where one or a few chromosomes have abnormal copy numbers, leading to gene imbalance and distinct syndromes.
  • Aberrant Euploidy
    Change involving the entire set of chromosomes, resulting in organisms with abnormal numbers of all chromosome sets.
  • Trisomic
    State in diploids with one extra chromosome, often causing disorders like Down syndrome due to gene dosage imbalance.
  • Monosomic
    State in diploids missing one chromosome, exemplified by Turner syndrome, leading to significant genetic imbalance.
  • Nolesomic
    Condition where a diploid organism lacks both copies of a chromosome, resulting in severe genetic consequences.
  • Disomic
    Haploid organism possessing an extra chromosome, disrupting the normal gene balance in single-set genomes.
  • Nondisjunction
    Failure of chromosomes to separate properly during cell division, causing abnormal chromosome numbers in cells.
  • Meiosis
    Cell division process forming gametes, where errors can lead to aneuploidy through improper chromosome segregation.
  • Mitosis
    Cell division process for growth and repair, where early errors can result in mosaic aneuploidy in developing organisms.
  • Gene Balance
    Ratio of genes on one chromosome to another, crucial for normal development and disrupted by aneuploidy.
  • Gene Dosage
    Relationship between gene copy number and gene product amount, with imbalances causing severe phenotypes.
  • Polyploidy
    Presence of extra sets of all chromosomes, generally less harmful than aneuploidy due to maintained gene balance.
  • Diploid
    Organism or cell with two complete sets of chromosomes, serving as the reference state for aneuploidy types.
  • Haploid
    Organism or cell with a single set of chromosomes, used to describe certain aneuploid conditions like disomy.