1. Plant Reproduction

3. Zygote (2n) M I T O S S I M E I O S S I Seed (disperses via wind or animals) Developing sporophyte Mature sporophyte flower (2n) Bottom of carpel Megasporangium Nutritive tissue (3n) Embryo (2n) Endosperm (3n) forms nutritive tissue in seed Megaspore (n: retained in ovary) Ovary M I T O S S I D O U B L E F E R T I L I Z A T I O N Egg Female gametophyte (n: retained in ovary) Pollen grain (male gametophyte) Microspore (n) forms pollen grain S S I O TI M M S S I O I E Ovule Top of stamen Anther P O L L I N A T I O N

5. stigma style ovary ovule megasporocyte micropyle The carpel

6. Creation of the megaspore

7. megaspore Creation of the megaspore

8. Creation of the female gametophyte

9. Polar nuclei Egg nucleus Creation of the female gametophyte

10. Polar nuclei Egg cell Mature female gametophyte = embryo sac

11. Review: Megasporocyte (2N) Megaspore (N) meiosis Megaspore (N) Female gametophyte (N) Mitosis and rearrangement Female gametophyte contains the egg cell

12. Stamen anther filament

13. Pollen sac Cross section of an anther microsporocyte

14. Creation of microspores microspore microsporocyte

15. microspore meiosis Creation of microspores Review: Next step: creation of male gametophyte

16. exine

17. Pollen grain Generative cell Tube cell nucleus

18. pollination

19. Tube nucleus Generative nucleus Pollen germination

20. Tube nucleus sperm

21. Tube nucleus Mature Male gametophyte

22. Review: microsporocyte (2N) microspore (N) meiosis microspore (N) Male gametophyte (N) Mitosis and rearrangement Male gametophyte contains the sperm

23. Polar nuclei Egg cell sperm Tube nucleus

24. Polar nuclei Egg cell sperm Tube nucleus

25. Polar nuclei Egg cell 2N Zygote 3N Primary endosperm nucleus Double Fertilization

26. endosperm embryo Seed coat fruit

27. Bean seed (typical eudicot) Corn seed (typical monocot) Seed coat Endosperm Cotyledons Embryonic stem and root