Title: Clones

Objectives: Today we are learning:

• What is a stem cell

• What are a homologous pair of chromosomes

• Outline the process of cell division by budding

• Cells produced by meiosis are not genetically

identical

Complete the crossword

Why does the nucleus of the donor egg have to be

removed

Why are do scientist have to collect nuclei from adult

body cells to implant into the donor egg rather than

just using gametes?

Cloned animals

What is a stem cell?

What is the difference between

Omnipotent and totipotent stem cells?

The only cells in a plant that can undergo mitosis are meristem

cells.

Some plants can reproduce asexually. A cutting can be taken

and given the right treatment this will grow into a new plant.

1. What does this tell us about the types of

cell present within these plants?

2. Why might this be useful to farmers?

3. What are the potential disadvantages?

Cloned plants (vegetative propagation)

Meiosis

Production of haploid cells (cells with half chromosome

number)

Production of Gametes

Produces 4 cells that are genetically different

• Where does this happen in humans does meiosis occur?

• Why is it important that meiosis produces genetically

different haploid cells?

• Why are is it important that gametes are haploid?