chromosome knob

例句：

1. 1.The geneticist examined the chromosomes of the patient to determine the cause of his disease.
   遗传学家检查了患者的染色体，以确定他疾病的起因。
2. 2. The researcher found that the chromosomes were abnormal in the patient's cells.
   研究员发现患者细胞的染色体异常。
3. 3. The scientists are studying the effects of mutations on chromosomes.
   科学家们正在研究突变对染色体的影响。