The prenatal period begins at conception and continues until the end of infancy.
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Q6: Both spermatogonia and oogonia are diploid cells.
Q7: A major function of amniotic fluid is
Q8: In the human,the function of the yolk
Q9: The placenta secretes human chorionic gonadotropin to
Q10: The fertilized ovum,or zygote,is genetically complete.
Q12: The daughter cells formed by meiotic division
Q13: Experiments have shown that the ovum actually
Q14: The chorion develops from the trophoblast to
Q15: During meiosis II,the phenomenon of "crossing over"
Q16: The blastocyst is a solid mass of
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