The Period of the Zygote (Conception to ~2 Weeks) Flashcards
(5 cards)
1
Q
When does the period of the zygote begin and how long does it last?
A
Begins at conception and lasts about 2 weeks.
2
Q
How long after conception does the first cell division occur?
A
About 30 hours.
3
Q
What forms within 4 days of conception?
A
A blastocyst containing 60–80 cells.
4
Q
When does implantation into the uterine wall occur?
A
Between 10–14 days after conception.
5
Q
What proportion of zygotes survive this stage?
A
Only about 1/4.
