Answer :
Following IVF, the zygote divides. When it reaches six to eight cells, one cell(s) is (are) removed for diagnosis, with no effect on normal development.
More about zygote:
A zygote is the result of the fusion of an egg cell and a sperm cell, sometimes referred to as a fertilised ovum or fertilised egg. In the days after conception, the zygote quickly divides from a single cell at first. The 46 chromosomes required are all present in the zygote's single cell, which receives 23 from the sperm and 23 from the egg.
Mitosis, a division process in which each cell doubles, occurs in zygotes (one cell becomes two, two becomes four, and so on). The term "germinal period" refers to this two-week period.
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