| 单词 | genetic variability |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔crossing over〕The exchange of genetic material between homologous chromosomes that occurs during meiosis and contributes to genetic variability.交换：一种发生在减数分裂期间的、有助于遗传变异的同源染色体之间的遗传物质的交换美国传统 |
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