Meiosis is a special type of cell division necessary for sexual reproduction. In animals, meiosis produces gametes like sperm and egg cells, while in other organisms like fungi it generates spores. This PowerPoint presentation on meiosis provides a good overview on the topic, and should be used as a foundation that triggers discussion and exploration with your audience.

Topics that the presentation covers are:

Why do we need meiosis?

• Meiosis is necessary to halve the number of chromosomes going into the sex cells
• Why halve the chromosomes in gametes?
  At fertilisation the male and female sex cells will provide ½ of the chromosomes each – so the offspring has genes from both parents

Also:

• how cells divide in meiosis
• division error
• meiosis error – fertilisation
• 21 trisomy – Downs Syndrome

Download the Meiosis PowerPoint Presentation.

The body’s immune system is a huge topic, but this PowerPoint presentation does a good job of presenting the main points:

• immunity: the body’s ability to fight infection and foreign invaders by producing antibodies or killing infected cells
• the immune system: responsible for maintaining homeostasis by distinguishing harmful organisms from non-harmful ones and produces an appropriate response.

Definitions

• Pathogens: Viruses, bacteria or other living thing that causes disease/immune response
• Antigens: Toxins that pathogens produce that cause harm to an organism

The Body’s 3 Lines Of Defense

1. The Skin. Provides physical and chemical barriers. Physical: hard to penetrate, made of indigestible keratin.
   Chemical; tears, sweat.
2. Nonspecific Immune Response. These are defenses the body uses no matter what the invader may be.
3. Specific Immune Response. This is a specific response to a specific pathogen/antigen.

This PowerPoint presentation of a guide to the human kidney describes the kidneys’ location within the body in relation to the:

• vena cava
• aorta
• right and left ureters
• bladder

There is also a photo of a kidney that is being operated on and a diagram of the cross section of a kidney.

The presentation then goes on to show how the kidney works with respect to cleaning the blood.

Summary

This PowerPoint presentation explains the process of mitosis. All complex organisms originated from a single fertilised egg. Every cell in your body started from this one egg and increased in numbers through cell division. Cells then specialise and adopt various different roles.

Mitosis is the process by which new body cells are produced for:

• Growth
• Cell replacement (old or damaged cells)

Mitosis is a complex process requiring different stages.

The parent cell splits into two daughter cells and all daughter cells contain the same genetic information copied from the original parent cell.

Every different type of cell in your body contains the same genes, but only some diversify into specialist cells – e.g. into nerve or muscle tissue.

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