16 ч 15 мин, 15 март 2002 г. - Fertilization

Описание:

The zygote forms when the sperm and egg come together in one of the fallopian tubes. The newly-formed zygote gets 23 chromosomes from each parent, so has 46 in total. The different chromosomes will determine different traits the baby has. This ranges from their sex to how they physically appear.

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