1. AP Biology Crosby High School
Plant Reproduction
AP Biology
Crosby High School

2. Flowers Male gametophyte: pollen grain Female gametophyte: embryo sac
Bisexual flower
Unisexual flower
Stamenate
carpellate
Monoecious
Dioecious

3. Gametophyte Development
Male
Microsporyte generates 4 microspores
Microspore divides creating generative and tube cells
Two cells and wall make grain
Female
Megasporyte forms 4 megaspores
1 megaspore divides 3 times
1 egg and 2 synergids
3 Antipodal cells
2 polar nuclei

4. Fertilization Self-fertilization Double fertilization
Unisexual cannot self-fertilize
Bisexual flowers often mature at different times
Self-incompatability
Double fertilization

5. Ovule Becomes a Seed Endosperm Development Embryo Development
Creation of Basal and Terminal cell
Basal ends becomes Suspensor
Terminal: spherical proembryo
Three primary meristems also form

6. Mature Seed
Hypocotyl
Radicle
Epicotyl

7. Embryo Development

8. Gametophyte Development