XXYY syndrome

（重定向自XXYY genotype）

48, XXYY syndrome is a sex chromosome anomaly in which males have an extra X and Y chromosome. Human cells usually contain two sex chromosomes, one from the mother and one from the father. Usually, females have two X chromosomes (XX) and males have one X and one Y chromosome (XY). The appearance of at least one Y chromosome with a properly functioning SRY gene makes a male. Therefore, XXYY normally only affects males. Males affected with XXYY syndrome have 48 chromosomes instead of the typical 46. This is why XXYY syndrome is sometimes written as 48, XXYY syndrome. It is estimated that XXYY affects one in every 18,000–40,000 male births.

单词	XXYY genotype
释义	XXYY genotype 原声例句 Osmosis-遗传 If failure also happens during meiosis in these germ cells as they give rise to gametes, other XXXXY, XXXY and XXYY genotypes that also lead to Klinefelter syndrome can result including the rare situation where there's an additional Y chromosome. 如果有丝分裂和减数分裂均发生了不分离，那么这类Klinefelter综合征患者的基因型就可能是XXXXY，XXXY和XXYY等，包括了同时多出一条Y染色体的罕见情况。英语百科 XXYY syndrome （重定向自XXYY genotype） 48, XXYY syndrome is a sex chromosome anomaly in which males have an extra X and Y chromosome. Human cells usually contain two sex chromosomes, one from the mother and one from the father. Usually, females have two X chromosomes (XX) and males have one X and one Y chromosome (XY). The appearance of at least one Y chromosome with a properly functioning SRY gene makes a male. Therefore, XXYY normally only affects males. Males affected with XXYY syndrome have 48 chromosomes instead of the typical 46. This is why XXYY syndrome is sometimes written as 48, XXYY syndrome. It is estimated that XXYY affects one in every 18,000–40,000 male births.
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