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  2. XXYY syndrome - Wikipedia

    en.wikipedia.org/wiki/XXYY_syndrome

    48,XXYY syndrome is a condition related to the X and Y chromosomes (the sex chromosomes). People normally have 46 chromosomes in each cell. Two of the 46 chromosomes, known as X and Y, are called sex chromosomes because they help determine whether a person will develop male or female sex characteristics. Females typically have two X chromosomes ...

  3. XXXY syndrome - Wikipedia

    en.wikipedia.org/wiki/XXXY_syndrome

    XXXY syndrome is a genetic condition characterized by a sex chromosome aneuploidy, where individuals have two extra X chromosomes. [2] People in most cases have two sex chromosomes: an X and a Y or two X chromosomes. The presence of one Y chromosome with a functioning SRY gene causes the expression of genes that determine maleness. Because of ...

  4. XYYY syndrome - Wikipedia

    en.wikipedia.org/wiki/XYYY_syndrome

    Sex chromosome aneuploidies are the most frequent form of aneuploidy in humans. [9] Though a 48-chromosome complement involving the autosomes would be unsurvivable, 48,XYYY and other high-level sex chromosome aneuploidies such as XXXY syndrome and tetrasomy X—or indeed 49-chromosome disorders such as pentasomy X—are survivable with ...

  5. Tetrasomy X - Wikipedia

    en.wikipedia.org/wiki/Tetrasomy_X

    Tetrasomy X, also known as 48,XXXX, is a chromosomal disorder in which a female has four, rather than two, copies of the X chromosome.It is associated with intellectual disability of varying severity, characteristic "coarse" facial features, heart defects, and skeletal anomalies such as increased height, clinodactyly (incurved pinky fingers), and radioulnar synostosis (fusion of the long bones ...

  6. Human genome - Wikipedia

    en.wikipedia.org/wiki/Human_genome

    The human genome is a complete set of nucleic acid sequences for humans, encoded as the DNA within each of the 24 distinct chromosomes in the cell nucleus. A small DNA molecule is found within individual mitochondria. These are usually treated separately as the nuclear genome and the mitochondrial genome. [1]

  7. XX male syndrome - Wikipedia

    en.wikipedia.org/wiki/XX_male_syndrome

    The SRY gene, normally found on the Y chromosome, plays an important role in sex determination by initiating testicular development. In about 80 percent of XX males, the SRY gene is present on one of the X chromosomes. [16] [25] The condition results from an abnormal exchange of genetic material between chromosomes (translocation).

  8. XYY syndrome - Wikipedia

    en.wikipedia.org/wiki/XYY_syndrome

    XYY syndrome, also known as Jacobs syndrome, is an aneuploid genetic condition in which a male has an extra Y chromosome. [1] There are usually few symptoms. [2] These may include being taller than average and an increased risk of learning disabilities.

  9. Karyotype - Wikipedia

    en.wikipedia.org/wiki/Karyotype

    The work took place in 1955, and was published in 1956. The karyotype of humans includes only 46 chromosomes. [77] [29] The other great apes have 48 chromosomes. Human chromosome 2 is now known to be a result of an end-to-end fusion of two ancestral ape chromosomes. [78] [79]