The chorion develops from the trophoblast to become an important fetal membrane in the placenta.
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Q9: The placenta secretes human chorionic gonadotropin to
Q10: The fertilized ovum,or zygote,is genetically complete.
Q11: The prenatal period begins at conception and
Q12: The daughter cells formed by meiotic division
Q13: Experiments have shown that the ovum actually
Q15: During meiosis II,the phenomenon of "crossing over"
Q16: The blastocyst is a solid mass of
Q17: The ovum lives for only about 24
Q18: In both oogenesis and spermatogenesis,the cytoplasm is
Q19: Meiotic division II is essentially the same
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