Selective breeding favored genes for reduced height, because they came along with genes for increasing yields to feed a growing population.

“现在，如果你走过小麦田，看到的小麦大概只到膝盖。

Selective breeding favored genes for reduced height, because they came along with genes for  increasing yields to feed a growing population.

选择性育种有利于降低身高的基因，因为它们伴随着增加产量的基因来养活不断增长的人口。