En este sentido, los seres humanos tenemos un total de 46 cromosomas organizados por parejas, es decir, 23 pares. Normalmente, en la adultez los afectados suelen superar los cm de altura. Retraso del desarrollo psicomotor De forma generalizada, el desarrollo motor de los individuos afectado suele ser deficiente desde las primeras etapas de la vida. Como consecuencia, la persona afectada presenta un total de 47 cromosomas en lugar de los Actualmente no existe una cura para esta enfermedad, por lo tanto, el tratamiento se orienta hacia en trabajo con las dificultades de aprendizaje o el retraso psicomotor. Referencias Alonso, G.
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What is XYY syndrome? Most people have 46 chromosomes in each cell. In males, this typically includes one X chromosome and one Y chromosome XY. XYY syndrome is a genetic condition that occurs when a male has an extra copy of the Y chromosome in each of their cells XYY. Sometimes, this mutation is only present in some cells. Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome.
For the most part, people with XYY syndrome live typical lives. Some may be taller than average and face learning difficulties or speech problems. They may also grow up with minor physical differences, such as weaker muscle tone. What causes XYY syndrome? Most cases of XYY syndrome are not inherited. The random error can occur during the formation of sperm or at different times during the formation of an embryo.
In the latter case, a male may have some cells that are not affected. The signs and symptoms of XYY syndrome differ from person to person and age to age. Symptoms in a baby who has XYY syndrome can include: hypotonia weak muscle tone delayed motor skill development, such as with walking or crawling delayed or difficult speech Symptoms in a young child or teenager with XYY syndrome can include: an autism diagnosis delayed motor skill development, such as with writing delayed or difficult speech hand trembling or involuntary muscle movements hypotonia weak muscle tone.
MI and MII are the stages of meiosis, while the blue and pink circles are male and female cells respectively, and the blue and pink bars are Y- and X-chromosomes respectively. The purple cell has 2 Y-chromosomes and 1 X-chromosome due to fusing with a male cell with 2 Y-chromosomes, which was due to division problems in MII of the male. An incident in chromosome separation during anaphase II of meiosis II called nondisjunction can result in sperm cells with an extra copy of the Y-chromosome. The syndrome is diagnosed in an increasing number of children prenatally by amniocentesis and chorionic villus sampling  in order to obtain a chromosome karyotype, where the abnormality can be observed. For the rest of those diagnosed after birth, around half are diagnosed during childhood or adolescence after developmental delays are observed. Epidemiology[ edit ] Around 1 in 1, boys are born with a 47,XYY karyotype.
Síndrome del XYY
Kondisi ini mengakibatkan kariotip 47,XYY dan dapat ditemui dalam 1 dari 1. Beberapa genetikawan medis mempertanyakan penggunaan istilah "sindrom"  karena fenotip klinis penyandang tetap normal   dan sebagian besar laki-laki dengan kromosom XYY tidak mengetahui kariotip mereka. Dalam Pyeritz, Reed E. San Diego: Elsevier Academic Press. This sex chromosome aneuploidy is not characterized by distinct physical features and, because there does not appear to be recognizable pattern of neurodevelopment or behavioral characteristics, the use of the term syndrome may be inappropriate.
Síndrome 47, XYY
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