This can happen as a result of nondisjunction of sex chromosomes during meiosis, and it happens more frequently in sperm cells - but egg cells can also be affected.
这可能是由于细胞在减数分裂期间性染色体未分离而造成的，而且这一情况在精子细胞中发生得更频繁，不过在卵细胞中也可能出现。
nondisjunction
/ˌnɒndɪs'dʒʌŋkʃən/ /ˌnɑndɪs'dʒʌŋkʃən/
英汉-汉英词典
n. 不分离
词组 | 习惯用语
您要查找的是不是：
- contradistinction n. 对比；对比的区别
- conjunctivitis n. [医]结膜炎
- nondiscrimination n. 不歧视
nondisjunction n. [遗] 不分离；不分开现象
网络短语:
nondisjunction gate 或非门
primry nondisjunction 初级不分离
primary nondisjunction 初级不离开
directed nondisjunction 定向不分离
equational nondisjunction 均等不分离
nondisjunction mosaic 不离开嵌合体
secondary nondisjunction 次级不分开；次级不离开
cytological nondisjunction 细胞学的不分离；细胞的不离开
mitotic nondisjunction 有丝分裂不分离
原声例句
Osmosis-遗传
英语百科
Nondisjunction
![1. Meiosis I 2. Meiosis II 3. Fertilization 4. Zygote The left image at the blue arrow is nondisjunction taking place during meiosis II. The right image at the green arrow is nondisjunction taking place during meiosis I. Nondisjunction is when chromosomes fail to separate normally resulting in a gain or loss of chromosomes.](/Images/godic/202501/30/Nondisjunction_Diagrams.svg2724.png")
![Nondisjunction of sister chromatids during mitosis:
Left: Metaphase of mitosis. Chromosome line up in the middle plane, the mitotic spindle forms and the kinetochores of sister chromatids attach to the microtubules.
Right: Anaphase of mitosis, where sister chromatids separate and the microtubules pull them in opposite directions.
The chromosome shown in red fails to separate properly, its sister chromatids stick together and get pulled to the same side, resulting in mitotic nondisjunction of this chromosome.](/Images/godic/202501/30/Mitotic_nondisjunction2724.png")
![Karyotype of X monosomy (Turner syndrome) This condition is characterized by the presence of only one X chromosome and no Y chromosome (see bottom right corner).](/Images/godic/202501/30/45,X2724.jpg")
![Karyotype of trisomy 21 (Down syndrome)
Note that chromosome 21 is present in 3 copies, while all other chromosomes show the normal diploid state with 2 copies. Most cases of trisomy of chromosome 21 are caused by a nondisjunction event during meiosis I (see text).](/Images/godic/202501/30/Down_Syndrome_Karyotype2724.png")
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division. There are three forms of nondisjunction: failure of a pair of homologous chromosomes to separate in meiosis I, failure of sister chromatids to separate during meiosis II, and failure of sister chromatids to separate during mitosis. Nondisjunction results in daughter cells with abnormal chromosome numbers (aneuploidy).
近义、反义、联想词
近义词
n.meiosis, miosis, reduction division
联想词
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