Other times, the desired trait, such as the ability to resist certain pests, can be absent in plantgenomes.
而另外的情况下，所需的特征，如能够抵抗某些病虫害的特征，不存在于植物基因组中。
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These "big bangs" in plant evolution occurred when the genomes of ancient plants duplicated, providing vast Numbers of new genes that could take on new functions and lead to new traits.
The distribution of repetitive DNAs along chromosomes is one of the crucial elements for understanding the organization and the evolution of plantgenomes.