1·To check an egg for chromosomal abnormalities, doctors use a laser to make a small incision in the outer membrane, which allows them to extract the polar body and the chromosomes it contains.
为了检查一个卵细胞的染色体是否异常，医生用激光在卵细胞外膜上切一小口，通过这个小口抽取极体及其所含的染色体。
2·The only difference is at the chromosomal level, deep inside the embryos' cells.
唯一的区别在于染色体的水平，它埋藏在胚胎细胞的深处。
3·This chromosomal region has been implicated in alcohol dependencein previous research.
这些染色体区域牵涉大酒精依赖症的先前研究。
4·The result is a new chromosomal pattern that is distinct from our own.
后果就是形成一种与我们自身完全不同的新的染色体类型。
5·Their study looked for chromosomal deletions and duplications known as copy number variants (CNV) and found that these were present in 16% of the children with ADHD.
他们研究被称为拷贝数变异（CNV）的染色体的删减和复制，发现在患有多动症的儿童中有 16% 都存在。