若在减数分裂中精母与卵母细胞的性染色体未分离，受精后形成的合子就会有额外的X染色体，形成XXY，此额外的X染色体，可来自卵子或精子。 此外受精卵在卵裂过程中X不分离，也可出 …

除了正常的XX和XY，性染色体也有可能表现为 XYY、XXY、XXX、X 或 XXYY 等各种核型。 少了条X染色体的女性，称为 Turner综合征，核型为（45,XO）。 X染色体缺失或异常，将会引起 …

XXXXY syndrome, sometimes called Fraccaro syndrome, [1] is a very rare genetic disorder. Normally, a male will have one X chromosome and one Y chromosome, but people with …

XXXXY syndrome also known as Fraccaro syndrome is an extremely rare sex chromosomal abnormality occurring in approximately 1 out of 85,000 to 100,000 males. A male typically has …

49，XXXXY是Klinefelter综合征的一种罕见核型，其发生可能缘于初级或次级卵母细胞在减数分裂时的染色体不分离，从而形成包含4条X染色体的卵细胞与正常精子受精而成。

49,XXXXY syndrome was first described by Fraccaro and Lindsten in 1960. The incidence is estimated to be approximately 1 in 85,000 newborn males (Pallister 1982). 1. Etiology: three …

XXXXY syndrome, also known as 49,XXXXY syndrome or Fraccaro syndrome, is an extremely rare aneuploidic sex chromosomal abnormality. It occurs in approximately 1 out of 85,000 to …

形成XXY染色体，又是47XXY，或称为克氏综合症，这种病的发病率为l%一2%，为出生男孩中1/1000比例。 常见核型为47, XXY。其余还有48, XXXY;46, XY/47, XXY等。 由于多余的X染 …

49,XXXXY syndrome may also be diagnosed with other disorders that can affect their ability to learn. Two XXXXY Uni nosed with autistic spectrum disorder, two with ADHD and one wi

2024年12月15日 · 49,XXXXY Syndrome, also sometimes known as Fraccaro Syndrome, is an extremely rare intersex variation in AMAB or CTM individuals in which they have three extra X...