child development puzzle

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Across
  1. 2. twins- if the cell mass decided to split in half and then divide
  2. 4. gene- weaker gene
  3. 6. gene- stronger gene
  4. 7. an egg cell
  5. 8. what the developing baby is called from the 3rd week of pregnancy
  6. 10. an infection caused by a parasite. can cause blindness, hearing loss, and learning disability
  7. 11. Germinal stage- first stage of pregnancy
  8. 12. sac- a sac that fills with fluid and surrounds the embryo
  9. 14. uses soundwaves to make video images,called a sonogram, of a unborn baby
  10. 15. Fetal Stage Stage- third and final stage of pregnancy
Down
  1. 1. twins- two ovums fertilized by two sperms
  2. 3. Embryonic stage- second stag of pregnancy
  3. 5. when sperm reaches the fallopian tubes, it may penetrate and fertilize the ovum
  4. 7. about every 28 days when an ovum is released by one of a womans two ovaries
  5. 9. incurable condition found in some children and mothers who consume alcohol during pregnancy
  6. 13. presentation- when the head is not turned down