Before egg fertilization, the gene produces a protein, found in the cytoplasm of the egg, that controls the pattern of cell division and thus handedness.

卵子受精之前，这种基因会产生一种蛋白质，这种蛋白质存在于卵子的细胞质中，它控制着细胞分裂的模式，从而控制着旋向性。

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The sperm fuses with the egg to begin the process of fertilization.

精子与卵子结合开始受精过程。

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Visualization of two pronuclei the following day confirms fertilization of the egg.

第二天看见两个核确定卵细胞受精。

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The result of fertilization now is a new cell that is the union of the sperm and the egg, and it's called the zygote and it contains the diploid number of chromosomes, genes.

受精就是产生,一个精卵结合的新细胞,称为受精卵,它含有二倍体的染色体基因

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It prevents ovulation or fertilization of an egg.

NPR: FDA: Morning-After Pill OK For Ages 15 And Up

Because egg freezing requires the use of in vitro fertilization for future pregnancies, its widespread adoption would also likely increase the use of preimplantation sex selection and genetic diagnosis, practices which pose a range of ethical dilemmas.

WSJ: The Ethics of Egg Freezing

If there has been fertilization, Plan B may prevent a fertilized egg from embedding in the uterus.

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