Plant Meiosis

Lily

Day Lily

Be able to identify and explain the functions of these floral parts in the diagram above.

anther

pistil

stamen

stigma

ovary

ovule

petals

receptacle

Dissect your class flower and identify these parts and sketch.

Study the diagram below and then study the diagram and slide pictures.

Lily Ovary

                                Cells and Nuclei - Two Cell and Four Cell Stage

Fomation of Pollen

Mature Pollen with Nuclei

Pollen  moving toward ovule                                                Bud formation

Web resources :  http://www.lima.ohio-state.edu/biology/flowers.html

Text references : Chapter 36 in Purves,Orians,Heller, and Sadava- Reproduction in flowering plants.

Objective : To study plant cell meiosis in the lily by using computer images and slides in the laboratory.  To study and compare floral types.

Picture from - Biology Coloring Book.  Color and define key words below.

Color code your pictures.  Use the Key below.

Key words ( see the list above )

Objectives:

• To draw the steps in lily meiosis from the class portfolio set, Internet references, or microscope slides during class.

• To be able to identify and differentiate the steps in the development of pollen and the egg

• To be able to identify steps in this process.

Draw:

Pollen development

• Mature anther

• One celled microspore

• mature pollen grains

Egg development

Megaspore mother cell

Metaphase I

Metaphase II

Embryo sac

Double fertilization

Conclusions:

1.  How does the formation of the male gamete in plants differ from spermatogenesis in animals?

2.  Explain the significance of the egg nucleus, the  polar nuclei, and the synergids?

3.  What is the purpose of double fertilization?