Claims that one percent of the world 's population are asexual would mean that 70 million people on earth feel no sexual attraction .
专家称百分之一的世界人口是无性恋者,这意味着地球上有7000万人感觉不到性吸引力。
He and his colleagues compared the dna from 10 corbicula species , some of which were sexual and some asexual .
他和同事们对比了十种蛤类的dna,这些蛤类既有有性繁殖的,也有无性繁殖的。
Due to asexual reproduction , the species as a whole retains very low genetic variation .
由于无性生殖,这样的物种整体保留着非常低的遗传变异。
The puzzle is , why hasn 't asexual reproduction taken over ?
令人费解的是:既然如此,为什么不让人接受“无性繁殖”呢。
Asexual reproduction does exist in patches of the natural world , but sex is everywhere .
无性繁殖只部分地存在于自然界,但“性”随处可见。
That process is part of the asexual reproduction of fungi , and the many different shapes may serve to help different species grow and reproduce in different conditions .
这一过程是真菌无性生殖的一部分,而且多种多样的形状也可能有助于不同的种类在不同条件下生长和繁殖。
In aspen , asexual reproduction or clonality is achieved via underground lateral roots that eventually produce new clone members / ramets .
For an asexual species to survive in the long run , it must refresh its genes every so often .
无性繁殖的物种为了生存更久,只有经常更新它们的基因。
Everything else being equal , this generates a 2-fold advantage for asexual females ( producing only female offspring ) .
对于无性生殖下的雌性来说(只生育雌性后代),如果其他一切条件相同,那么这会带来双倍的优势。
A european study has shown that asexual creatures can carry out an evolutionary trick to adapt to changing conditions , without the genetic mixing that occurs in sexual reproduction .