Unit 5 comparitive reproduction

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Across
  1. 3. fertilization done outside of the organism
  2. 4. a ripened plant ovary
  3. 7. structure that allows diffusion of oxygen, nutrients and waste between mother and fetus
  4. 8. gametes have 23 but body cells have 46
  5. 11. a trait that provides an advantage in a particular environment
  6. 12. carries plant sperm cells
  7. 13. fertilization done inside the oviduct
  8. 15. the genetic chemical that codes for life
  9. 17. where the embryo develops in a mammal
  10. 19. process that makes gametes from ovaries and testes
  11. 20. a hormone secreted by the ovary
Down
  1. 1. sperm and egg combine genetic material
  2. 2. the guy who is famous for the theory of evolution by natural selection
  3. 5. cell division that makes identical copies
  4. 6. where fertilization takes place in mammals and birds
  5. 9. chemical released by glands that send messages to different tissues
  6. 10. testicular gamete
  7. 14. the reproductive organ of a plant
  8. 16. segments of DNA that code for proteins and traits
  9. 18. ovarian gamete