Thirdly, using RAPD technique to amplify DNA of the AALY001 NMS two lines, one specific marker NMSOPM09500 was obtained in the male fertile line but without in the male sterile line.

最后，选择万寿菊核不育两用系AALY001为材料，对雄性不育株和可育株进行扩增，得到了一条在不育株中缺失，在可育株中出现的稳定的特异标记NMSOPM09500。

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He kindly offers them an extra egg laid by a fertile couple, and the male penguins take turns keeping it warm.

他好心地从别的企鹅那里找来一颗蛋，这两只雄性企鹅便轮流给它保暖。

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They suspect it prevents males from wasting their combative energy.After all, why bother fighting another male for a female unless she is fertile?

他们猜测这种因子能够防止浪费雄性用以好斗的能量。

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These eggs were then transplanted into a female mouse and healthy offspring were born who grew into fertile male and female adult mice.

BBC: Stem cell sperm study leads to successful mouse births

The first male humans had an incentive to seek fertile women as the means of spreading their genes.

CNN: Men see bikini-clad women as objects, psychologists say