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Extra X and Y chromosome in males
XXYY syndrome is a sex chromosome anomaly in which males have two extra chromosomes, one X and one Y chromosome. Human cells usually contain two sex chromosomes
XXYY_syndrome
Medical condition
others. Those with XXXY syndrome tend to display less externalizing and internalizing behaviors compared to those with 48,XXYY syndrome, which may have a positive
XXXY_syndrome
Human chromosomal condition
anomalies such as 48,XXXY, 48,XXYY or 49, XXXYY are considered variants of Klinefelter syndrome. Klinefelter syndrome occurs randomly. An older mother
Klinefelter_syndrome
Chromosomal disorder
gametes. XXXYY syndrome, by its nature, requires multiple steps of nondisjunction. Possible causes include fertilization of a normal egg by an XXYY sperm, fertilization
XXXYY_syndrome
X chromosome monosomy
Turner syndrome (TS), commonly known as 45,X, or 45,X0, is a chromosomal disorder in which cells of females have only one X chromosome instead of two,
Turner_syndrome
Genetic disorder
Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome
Down_syndrome
Syndromes
XXXY syndrome XXYY syndrome XY gonadal dysgenesis XYY syndrome Yellow nail syndrome Yemenite deaf-blind hypopigmentation syndrome Yentl syndrome Yim–Ebbin
List_of_syndromes
Chromosomal anomaly
XXXXY syndrome, also known as 49,XXXXY syndrome or Fraccaro syndrome, is an extremely rare aneuploidic sex chromosomal abnormality. It occurs in approximately
XXXXY_syndrome
Chromosomal disorder
discovered, being preceded by Turner, Klinefelter, and trisomy X in 1959, XXYY syndrome in 1960, and XYY and tetrasomy X in 1961. By the time of Linden, Bender
Pentasomy_X
Genetic condition in which a male has an extra Y chromosome
Klinefelter syndrome XXYY syndrome XYYY syndrome XXXYY syndrome XXYYY syndrome XYYYY syndrome Turner syndrome Trisomy X "47,XYY syndrome". Genetics Home
XYY_syndrome
Index of articles associated with the same name
Cheryl; Zeitler, Philip (2011). "48,XXYY, 48,XXXY and 49,XXXXY syndromes: not just variants of Klinefelter syndrome". Acta Paediatrica. 100 (6): 851–860
Sex_chromosome_anomalies
Human chromosomal condition
Turner syndrome, XYY syndrome (known as Superman or Jacobs syndrome), 47,XXX (known as trisomy X), 48,XYYY, 48,XXYY, mosaicism 46,XY/47,XYY, 48,XXYY, 49
XXYYY_syndrome
Medical condition
Pallister-Killian syndrome (tetrasomy 12p) Tetrasomy 9p Tetrasomy 18p Tetrasomy 21, a rare form of Down syndrome Tetrasomy X XXYY syndrome XXXY syndrome
Tetrasomy
Extreme or rapid change in mood
known as seasonal mood swings. XXYY syndrome: XXYY syndrome is a rare type of sex chromosome aneuploidies (SCAs). XXYY syndrome contributes to abnormal neurodevelopment
Mood_swing
Atypical congenital variations of sex characteristics
D'Epagnier C, Zeitler P (June 2011). "48,XXYY, 48,XXXY and 49,XXXXY syndromes: not just variants of Klinefelter syndrome". Acta Paediatrica. 100 (6): 851–860
Intersex
Reproductive system of the human male
Turner's syndrome - a single X chromosome is present, Klinefelter's syndrome - two X chromosomes and a Y chromosome are present, XYY syndrome and XXYY syndrome
Male_reproductive_system
Sideways curving of a finger or toe
de Lange syndrome Orofaciodigital syndrome 1 13q deletion syndrome XXYY syndrome Silver–Russell syndrome Noonan syndrome Ehlers–Danlos syndrome Andersen–Tawil
Clinodactyly
Condition present at birth regardless of cause
as limb anomalies, syndromes involving multiple systems, and Down syndrome. Recent studies have concluded that 5–9% of Down syndrome cases are due to paternal
Birth_defect
RV, Turner S, Ledbetter DH, Martin CL (1993). "17q12 Recurrent Deletion Syndrome". In Adam MP, Ardinger HH, Pagon RA, Wallace SE, Bean LJ, Stephens K, Amemiya
List_of_genetic_disorders
Sex-specific patterns of inheritance
27 March 2025. "Klinefelter syndrome: MedlinePlus Genetics". medlineplus.gov. Retrieved 27 March 2025. "48,XXYY syndrome: MedlinePlus Genetics". medlineplus
Sex_linkage
Sex chromosome in the XY sex-determination system
only one chromosome) except in cases of aneuploidy such as XYY syndrome or XXYY syndrome. Traits that are inherited via the Y chromosome are called Y-linked
Y_chromosome
Natural premature termination of pregnancy
risk of miscarriage, including diabetes, endometriosis, polycystic ovary syndrome (PCOS), hypothyroidism, certain infectious diseases, and autoimmune diseases
Miscarriage
Medical condition
Fryns–Aftimos syndrome (also known as Baraitser–Winter syndrome 1, or BWS1) is a rare chromosomal condition and is associated with pachygyria, severe
Fryns–Aftimos_syndrome
Chromosomal disorder with 4 X chromosomes
D'Epagnier C, Zeitler P (June 2011). "48,XXYY, 48,XXXY and 49,XXXXY syndromes: not just variants of Klinefelter syndrome". Acta Paediatrica. 100 (6): 851–860
Tetrasomy_X
Failure to separate properly during cell division
chromosomes (48,XXXY; 48,XXYY; 49,XXXXY), mosaicism (46,XY/47,XXY), or structural chromosome abnormalities. The incidence of XYY syndrome is approximately 1
Nondisjunction
rare (NIH) 47, XXY syndrome 47, XYY syndrome 47, XXX syndrome 48, XXXX syndrome 48, XXYY syndrome 49, XXXXX syndrome 49, XXXXY syndrome 5 alpha reductase
List_of_diseases_(0–9)
Abnormal multiples of one or more chromosomes
other X polysomies (48,XXXX, 48,XXXY, 48,XXYY) is more rare than 49,XXXXY. Polysomy Y (47,XYY; 48,XYYY; 48,XXYY; 49,XXYYY) occurs in 1 out of 975 males
Polysomy
American research foundation established in 2005
X (Turner syndrome): · 47,XXX (Triple X syndrome; Trisomy X) · 47,XXY (Klinefelter syndrome) · 47,XYY (Jacob syndrome) · 48,XXXY · 48,XXYY · 48,XXXX ·
The_Focus_Foundation
Medical condition
Klinefelter syndrome (47,XXY) XXYY syndrome (48,XXYY) XXYYY syndrome (49,XXYYY) XXXY syndrome (48,XXXY) XXXYY syndrome (49,XXXYY) XXXXY syndrome (49,XXXXY)
Miscarriage and mental disorders
Miscarriage_and_mental_disorders
Presence of an abnormal number of chromosomes in a cell
found in Down syndrome, affecting 1 in 800 births. Trisomy 18 (Edwards syndrome) affects 1 in 6,000 births, and trisomy 13 (Patau syndrome) affects 1 in
Aneuploidy
Mammalian protein found in Homo sapiens
chromosome aneuploidy conditions such as triple X, XYY, Klinefelter, XXYY and similar syndromes. SHOX is composed of 6 different exons and is located in the pseudoautosomal
Short-stature_homeobox_gene
Sex chromosome present in both sexes in the XY and X0 sex-determination systems
Klinefelter syndrome is in general in the normal range, although below average. When additional X and/or Y chromosomes are present in 48,XXXY, 48,XXYY, or 49
X_chromosome
Factors that increase the chance of a miscarriage
rejection Autoimmune disorder Coeliac disease Lupus Antiphospholipid antibody syndrome Anti-thyroid autoantibodies Placenta abnormality Previous miscarriage Eating
Miscarriage_risks
chondrodysplasia punctata Xeroderma pigmentosum (Cockayne syndrome complex) XXYY genotype Zimmermann–Laband syndrome Infection-related cutaneous conditions may be
List_of_skin_conditions
Inactivation of one parent's X chromosome more so than the other's
mutations in the Xist promoter were detected. Klinefelter 47,XXY and 48,XXYY patients were found to have significantly skewed X-chromosome levels in 31%
Skewed_X-inactivation
Species of fruit fly
when mutated. D. melanogaster is also used in studies of aging. Werner syndrome is a condition in humans characterized by accelerated aging. It is caused
Drosophila_melanogaster
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