A female stores sperm and can determine the sex of each egg she lays by fertilizing it or leaving it unfertilized.
雌性储存精子，可以通过受精或不受精来决定每一个卵细胞的性别。
Conception occurs when a single sperm fuses with an egg.
当一个精子和一个卵子结合时受孕就发生了。
On this butterfly egg, the lacy pattern marks the micropyle, where sperm enters.
在这种蝴蝶卵上，花边图案标记精子进入的卵孔。
This couldhappen because a chimeric twin that grew from an egg which his sperm did notfertilise would nonetheless have some skin cells containing his genes.
发生此类现象是因为一个嵌合双胞胎会产生于没有得到雄性动物施精的卵, 但它会在某些皮肤细胞中含有该雄性动物的遗传基因.
It takes about 175, 000 sperm cells to weigh as much as a single egg cell.
一个卵细胞的重量相当于约175 000个精细胞的重量。
We focused on several key events during fertilization from membrane fusion to karyogamy of sperm cells and egg cells.
探讨了从精细胞和卵细胞质膜融合到它们的核融合完成这一发育阶段的某些主要事件。
It is the first time in the world that this has been achieved using somatic cells (cells that are not sperm or egg cells) from any animal with hooves (known as ungulates).
这是全世界首次使用任何有蹄脚的动物(被称为有蹄类动物)的体细胞(不是精细胞或卵细胞的细胞)实现了这一成果。
It is the first time in the world that this has been achieved using somatic cells (cells that are not sperm or egg cells) from any animal with hooves (known as ungulates).
这是全世界首次使用任何有蹄脚的动物(被称为有蹄类动物)的体细胞(不是精细胞或卵细胞的细胞)实现了这一成果。
应用推荐