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PGS341 Ch.2 Other C
The Period of the Zygote (Time Span / What happens)
Question | Answer |
---|---|
9-16 days of the menstrual cycle | An egg cell from the ovary enters the Fallopian tube |
Within 24 hours of ovulation | Fertilization usually takes place in the upper third of the Fallopian tube |
24-30 hours after fertilization | Male (sperm) & female (egg) chromosome material unite |
36 hours after fertilization | egg cell divided for the first time and has now become two cells |
48 hours after fertilization | 4 cells |
3 days | A cluster of 16-32 cells |
4 days | A hollow ball of about 100 cells |
4-5 days | Zygote enters the uterus |
6-7 days | Zygote begins to attach to the wall of the uterus |
12-14 days | Zygote is completely implanted in the uterine wall |