Answer :
The period of the zygote begins with fertilization and ends with implantation, which takes about 2 weeks.
Fertilization can be defined as the union of two haploid gametes, the sperm, and the ovum, here referred to as the egg, to restore the diploid state, form a zygote through the process of activating the ovum, and initiate a series of mitotic divisions with consequent cell differentiation and embryonic development.
Implantation is a process that occurs after an embryo - a fertilized egg - travels down the fallopian tube and goes deep into the lining of the uterus, where it remains until birth. While many regard fertilization as the start of pregnancy, successful implantation is another crucial hurdle.
The period required for the zygote to be completely implanted in the lining of the uterus is 2 weeks.
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