Males normally have one X and one Y chromosome. When the XYY type was discovered, some researchers speculated that the presence of an extra Y chromosome might make a male more aggressive and prone to criminal behavior.
Some affected individuals have learning problems, such as delayed speech and difficulty with articulation. Her results after examining XYY males had many implications regarding the tendency toward aggressiveness and—more importantly—many of the psychological tendencies that may lead to aggressive behaviors.
Awareness and appropriate therapy or counseling for both patients and families can overcome the problems and allow these men to lead normal lives.
Males normally have one X and one Y chromosome. No sound evidence suggests that affected men are more prone to aggression or violence or that they should be absolved of responsibility for their actions, criminal or otherwise. Introduction In the past, there were many misconceptions about this disease.
Speech, physical, and occupational therapies can also prove beneficial. Such aneuploidies, which can involve either the X or Y chromosome and a varying number of extra chromosomes, are the most common type of chromosomal disorders, occurring in around 1 in live births.
Caused by a YY-bearing sperm fertilizing a normal X-bearing egg, the XYY embryo develops along a seemingly normal route and, unlike most other sex chromosome diseases, is not apparent at birth.
Sex chromosome abnormalities can be diagnosed before birth by amniocentesis and chorionic villi sampling. In other respects, their appearance and fertility are essentially normal. For a normal human male the karyotype would be 46, XY i.
Attention deficit and hyperactivity disorder, difficulties with social interactions, or other behavioral problems can be treated with therapy or medication the same as in individuals who do not have XYY. Reading difficulties are common due to an increased incidence of dyslexia.
The chromosomes that are not sex chromosomes i. Defects or disruptions mutations of the fibrillin-1 FBN1 gene have been linked to Marfan syndrome and related disorders. Popular science writers promoted the idea that men with an extra Y chromosome were more aggressive than XY males.
Thus an impetus to reassessment of the sex aneuploid groups presents itself. In the past, a prenatal diagnosis of XYY syndrome led parents to terminate a pregnancy. Boys with XYY syndrome typically have normal intelligence, although, on average, IQ is 10 to 15 points lower than siblings.
Common physical features may include tall stature, lack of secondary pubertal development, small testes hypogonadismdelayed pubertal development, and breast development gynecomastia in late puberty. XYY males can be difficult, but they are not generally dangerous. Some early studies of prison populations and mental institutions seemed to confirm this hypothesis.
Allowing for background variables—that is, comparing XYY males with XY males of similar IQ, height, and social status—the rate of criminality in XYY males is significantly higher than for normal males, although the difference is slight. First, criminals and their defenders hope to gain acquittal or reduced sentences by pleading mitigating circumstances, suggesting the defendant was not responsible for his or her actions.
EEG traces show significantly slower background activity than those of similar aged nonaffected males. Large body size during childhood, adolescence, and early adulthood will no doubt cause people to treat these individuals differently, and they may in turn have learned to use their size defensively.
Many such children develop perfectly normally, with no ill effects from their condition. Screening for those X chromosome aneuploidies was possible by noting the presence or absence of "female" sex chromatin bodies Barr bodies in the nuclei of interphase cells in buccal smearsa technique developed a decade before the first reported sex chromosome aneuploidy.
Validity means that a study or experiment tests what it is meant to test. XYY syndrome is not always visible in the phenotype. However, these were mainly nonviolent crimes such as vehicular offenses and shoplifting.
Connective tissue is found all over the body and multiple organ systems may be affected in individuals with Marfan syndrome. Shaylene Van Gorkum Nov 7, 1: Gotz also found a significantly higher frequency of antisocial behavior in the XYY males in both adolescence and adulthood. Bentley Glasscheered by the legalization of abortion in New York envisioned a future where pregnant women would be required by the government to abort XYY "sex deviants".
47,XYY syndrome is caused by the presence of an extra copy of the Y chromosome in each of a male's cells. As a result of the extra Y chromosome, each cell has. Learn XYY, Jacobs syndrome with free interactive flashcards. Choose from 27 different sets of XYY, Jacobs syndrome flashcards on Quizlet.
Viewpoint: Yes, the best studies of XYY males indicate that they are more prone to aggressive behavior than XY males. The XYY syndrome is a genetic irregularity that gives the male an extra Y chromosome.
Four new examples of the XYY karyotype were ascertained in a survey of selected male populations. Among men cm (6 ft) or greater in height, two out of 86 te.
Four new examples of the XYY karyotype were ascertained in a survey of selected male populations. Among men cm (6 ft) or greater in height, two out of 86 tested in a state prison, one out of 76 tested in a mental hospital, and none in 30 normal men were found to be XYY.
xyy syndrome to another. 22 The field within the science of biology that studies heredity is called genetics, and behavior genetics bridges the sciences of psychol.A study of the xyy syndrome