Description
Ovum at time of fertilisation (conception) with male gamete (sperm)
Zygote at 2-cell stage, approx. 30 hours after fertilisation
Zygote at 4-cell stage, after around 40-50 hours
Zygote at 8-cell stage, after around 55 hours
Morula
Blastocyst after around 4 days
Blastocyst after around 5 days
Blastocyst after around 8-9 days
Germ cells at approx. 11th day
Germ cells at approx. 20th day
Embryo at around the end of the 1st month of pregnancy
Embryo at around the end of the 2nd month of pregnancy
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