While this is occurring an unfertilized egg cell is taken from a Blackface ewe with its DNA filled nucleus taken out leaving a nucleus free egg cell that will later produce an embryo (3).
(接着如果把它)放在一个细去
的
羊的的营养细
中,它一会儿就会产生一个胚芽。
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Big seeds that can take advantage of the good conditions to grow quickly will now be favored over small seeds that were previously favored on dry, unfertilized hillsides where seeds were sparser and competition less intense.
能够利用良好条件快速生长的大种子现在将比以前在干燥、未施肥的山坡上受到青睐的小种子受到青睐,因为那里种子稀疏,竞争不那么激烈。