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  2. XYY syndrome - Wikipedia

    en.wikipedia.org/wiki/XYY_syndrome

    In the wake of the establishment of the normal number of human chromosomes, 47,XYY was the last of the common sex chromosome aneuploidies to be discovered, two years after the discoveries of 47,XXY, [27] 45,X [28] and 47,XXX [29] in 1959. Even the much less common 48,XXYY [30] had been discovered in 1960, a year before 47,XYY.

  3. Genetics of aggression - Wikipedia

    en.wikipedia.org/wiki/Genetics_of_aggression

    The field of psychology has been greatly influenced by the study of genetics. [1] Decades of research have demonstrated that both genetic and environmental factors play a role in a variety of behaviors in humans and animals (e.g. Grigorenko & Sternberg, 2003). The genetic basis of aggression, however, remains poorly understood. Aggression is a ...

  4. XYYY syndrome - Wikipedia

    en.wikipedia.org/wiki/XYYY_syndrome

    The presentation of XYYY syndrome is variable and at this time not entirely clear. As all known cases were diagnosed postnatally (after birth), and the similar XYY syndrome is known to have a milder phenotype in prenatally than postnatally diagnosed cases, it is suspected that many cases of XYYY syndrome may be mild or asymptomatic.

  5. Sex chromosome anomalies - Wikipedia

    en.wikipedia.org/wiki/Sex_chromosome_anomalies

    Sex chromosome anomalies belong to a group of genetic conditions that are caused or affected by the loss, damage or addition of one or both sex chromosomes (also called gonosomes). In humans this may refer to: 45, X, also known as Turner syndrome; 45,X/46,XY mosaicism, also known as X0/XY mosaicism and mixed gonadal dysgenesis; 46, XX/XY

  6. Patricia Jacobs - Wikipedia

    en.wikipedia.org/wiki/Patricia_Jacobs

    Despite her work being on XXY syndrome, the XYY syndrome is instead sometimes called Jacobs syndrome: [6] After it had been incidentally discovered by Avery Sandberg in 1961, [7] the syndrome was also found in a chromosome survey of 315 men at a hospital for developmentally disabled, made by Jacobs and hence considered the first little research ...

  7. 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 ...

  8. Pseudoautosomal region - Wikipedia

    en.wikipedia.org/wiki/Pseudoautosomal_region

    The SHOX gene in the PAR1 region is the gene most commonly associated with and well understood with regards to disorders in humans, [17] but all pseudoautosomal genes escape X-inactivation and are therefore candidates for having gene dosage effects in sex chromosome aneuploidy conditions (45,X, 47,XXX, 47,XXY, 47,XYY, etc.).

  9. 45,X/46,XY mosaicism - Wikipedia

    en.wikipedia.org/wiki/45,X/46,XY_mosaicism

    45,X/46,XY mosaicism, also known as X0/XY mosaicism and mixed gonadal dysgenesis, [1] is a mutation of sex development in humans associated with sex chromosome aneuploidy and mosaicism of the Y chromosome. It is a fairly rare chromosomal disorder at birth, with an estimated incidence rate of about 1 in 15,000 live births. [2]