せんしょくたいじょう 染色体異常
1. chromosomal abnormality; chromosomal disorderGenetics
Wikipedia definition
2. Chromosome abnormalityA chromosome anomaly, abnormality or aberration reflects an atypical number of chromosomes or a structural abnormality in one or more chromosomes. A karyotype refers to a full set of chromosomes from an individual which can be compared to a "normal" karyotype for the species via genetic testing. A chromosome anomaly may be detected or confirmed in this manner. Chromosome anomalies usually occur when there is an error in cell division following meiosis or mitosis.
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