|
染色体的问题
现代科学研究发现了大量非典型的染色体组合类型。下面描述的仅仅是这中间最要害的组合类型。通常，非典型染色体组合涉及XX或XY的非常规结合。人口中有0.5%-1.0%的发生率。
|
|
In Boys
1.
（Klinefelter Syndrome）,
既，染色体组合为XXY（或非常罕见的XXXY）。患者表现为睾丸发育不良，雄性激素水平低，乳房发育，有不成比例的上下肢，不能生育和可能有渐进发展的智力缺陷。在青春期给予激素治疗常常能够发育出男性的身体特征。该综合征在1000个活产中会有一例。
2. （XYY Syndrome），
表现为性器官畸形和生育力低下，也可能有渐进发展的智力缺陷。该综合征在1000个活产中会有一例。
|
|
Chromosomal
Problems
Modern
research has found a number of
possible atypical chromosomal
conditions. The following desribes
only the most important of them. As
a rule, they concern deviations from
the regular XX- or XY-combination.
They are found in ca. 0,5 to 1
percent of the population.
|
|
In Boys
1. The so-called Klinefelter Syndrome, i.e. the chromosomal combination XXY (or, very rarely, XXXY). It manifests itself in underdeveloped testicles, a low level of testosterone, a growth of breasts, disproportionate arms and legs, infertility and an increased likelihood of mental deficiency. Hormonal treatments in adolescence can often achieve a masculinization of the body. The syndrome is found in one of ca. 1000 live births.
2. The XYY Syndrome manifests itself in malformations of the sex organs and reduced fertility. There is also an increased likelihood of mental deficiency. The syndrome is found once in ca. 1000 live births.
|
