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Sex-Linked Genes definitions

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  • Sex Chromosome
    A chromosome responsible for determining biological sex, present as X and Y in humans with distinct gene content.
  • X Chromosome
    A large chromosome carrying hundreds of genes, many unrelated to sex, present in both males and females.
  • Y Chromosome
    A small chromosome with few genes, including a key factor for male development, present only in males.
  • SRY Gene
    A genetic sequence on the Y chromosome that triggers male development, absent in females.
  • Hemizygous
    A condition where only one copy of a chromosome or gene is present, as with the Y chromosome in males.
  • Homologous Pair
    A set of chromosomes of the same type, one from each parent, typically carrying the same genes.
  • Pseudoautosomal Region
    A segment shared by X and Y chromosomes, enabling them to pair and segregate properly during meiosis.
  • Meiosis
    A cell division process that produces gametes, ensuring proper chromosome number in offspring.
  • Nondisjunction
    An error during cell division where chromosomes fail to separate, leading to abnormal chromosome numbers.
  • Sex Linkage
    A pattern of inheritance for genes located on sex chromosomes, causing traits to be passed differently in males and females.
  • X-Linked Inheritance
    A mode of inheritance where gene mutations on the X chromosome affect males and females differently.
  • Y-Linked Inheritance
    A rare inheritance pattern involving genes on the Y chromosome, affecting only males.
  • Sex-Limited Inheritance
    A trait expression restricted to one sex, such as size differences in certain animal species.
  • Sex-Influenced Inheritance
    A trait whose expression varies between sexes due to hormonal differences, like pattern baldness.
  • Phenotype
    The observable characteristics or traits of an organism, influenced by genetic and environmental factors.