the first chromosome 第1染色体的
In 1995, the first news of a genetic basis for bed-wetting made headlines, after Danish researchers reported a link to Chromosome 13.
1995年，在丹麦研究人员发表关于13号染色体的文章之后，第一则关于“尿床的遗传因素”的消息曾引起轰动。
The first is that males are more sensitive because they have only one X-chromosome.
第一个理论认为男性更敏感， 谏因为他们只有一个X染色体。
The study, published in the March issue of Genes & Development, also reports the first meiosis-specific factor ever found on the X chromosome.
刊登在3月份的“基因与发育”（Genes & Development）期刊上的一篇文章同样报道了首次发现的位于X染色体上的与减数分裂相关的因子。
But some people are born with an extra copy of the twenty-first chromosome.
VOA: special.2009.09.09
"We are here today to announce the first synthetic cell -- a cell made by starting with the digital code in the computer, building the chromosome from four bottles of chemicals, assembling that chromosome in yeast, transplanting it into a recipient bacterial cell and transforming that cell into a new bacterial species."
VOA: special.2010.07.20
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