The Period of the Zygote (Time Span / What happens)
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 9-16 days of the menstrual cycle | An egg cell from the ovary enters the Fallopian tube
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| Within 24 hours of ovulation | Fertilization usually takes place in the upper third of the Fallopian tube
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| 24-30 hours after fertilization | Male (sperm) & female (egg) chromosome material unite
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| 36 hours after fertilization | egg cell divided for the first time and has now become two cells
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| 48 hours after fertilization | 4 cells
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| 3 days | A cluster of 16-32 cells
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| 4 days | A hollow ball of about 100 cells
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| 4-5 days | Zygote enters the uterus
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| 6-7 days | Zygote begins to attach to the wall of the uterus
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| 12-14 days | Zygote is completely implanted in the uterine wall
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