At the end of the second week after fertilization (fourth week of gestation)when the fertilized ovum implants in the uterine lining, the fertilized ovum becomes

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At the end of the second week after fertilization, the fertilized ovum becomes an embryo. The zygote is the initial cell formed by the fusion of the egg and sperm, and the blastula is a stage of development immediately following fertilization. The fetus is not formed until later in gestation.

At the End of the Second Week After Fertilization (Fourth