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1 st week of pregnancy: fertilisation
During fertilisation, a spermatozoon will fertilise an oocyte in one of the Fallopian tubes to form a single-cell entity called a zygote. This egg, consisting of 46 chromosomes (23 from the mother and 23 from the father), migrates to the uterine cavity and begins to divide to form a group of cells called a morula.
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