穗部性状、农艺性状和品质性状除粒色和株高外，选育品种变异性呈下降的趋势，而病害性状多表现出明显的增加。
Except grain color and plant height, the diversity in spike, agronomic and quality characters of bred varieties has the trends to decrease, but to increase in diseases.
《科学》杂志在发表这个序列的同时还发表了三篇论文，其中一篇比较了27个全球代表性玉米品种基因组的特定区域，从而展示遗传变异的共同模式。
Science published three papers alongside the sequence, one of which compares specific sections of the genome of 27 globally representative maize varieties to show common patterns of genetic variation.
但白虎仅仅是一种罕见的遗传变异，而不是一个不同的品种。
But white tigers are rare genetic mutations, not a different species.
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