biology

• Communicable Disease


  Can be spread person to person
• Causes of Communicable Diseases

  • Bacteria
  • Viruses
  • Fungi
• Communicable Diseases


  • Measles
  • Malaria
• Non-Communicable Disease


  This can't be spread
• Non-Communicable Diseases


  • Coronary heart disease
• Factors that interact with health

  • Physical health
  • Viruses
  • Immune system
  • Mental illness
• People with weak immune systems are more likely to get communicable diseases
• Viruses can infect cells in the body which can lead to cancer
• Physical health problems may lead to mental health problems
• Pathogens are fought by the immune system
• Mitosis


  Cell division where identical copies of a cell are made, e.g. when organisms grow
• Cell division by mitosis

  1. Cell cycle

  2. DNA forms X-shaped chromosomes

  3. Cell grows and DNA replicates

  4. Increases number of sub-cellular structures like mitochondria and ribosomes

  5. DNA is copied and each new cell has a copy
• Gametes


  • Haploid set of chromosomes
• Fertilisation


  1. Egg + Sperm

  2. Produces offspring
• Offspring receives mixture of genes from both parents</b>
• Mixture of genes from both parents produces variation in the offspring