Biology
- Created by: helig
- Created on: 13-05-19 19:14
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- Biology
- DNA
- Genetic Profiling
- Criminals can be positively idenified if DNA samples from the crime scene match theirs.
- If there is a dispute as to who is the father of a child, the fathers DNA will have similarities with the child.
- Genetic Profiling can detect certain genes that may be associated with a particular disease.
- Genetic Profiling
- Microorganisms and diseases
- The immune system
- The skin is an impenetrable barrier against organisms. Most of the body is covered in skin, apart from body openings.
- If the skin is broken then the blood at the site of the wound clots, sealing the gap.
- If they get inside the body, pathogens are killed by white blood cells. There are two types:
- Phagocytes, which ingest microorganisms and digest them.
- Lymphocytes, which produce chemicals called antibodies which destroy microorganisms and others called antitoxins which neutralise any poisons produced by the pathogen.
- The immune system
- Variation and evolution
- Evolution
- Natural selection
- All populations vary, due to past mutations.
- Most organisms over-produce, i.e. they produce more offspring than can possibly survive. This is so they have a higher chance of increasing their population.
- Natural selection
- Evolution
- The variety of life
- Adaptation to the environment
- Features develop that help the organisms to survive, so if similar organisms live in different environments they will adapt in different ways.
- Morphological adaptations are structural adaptations of the organism for example, colour of fur, and leg length
- Behavioural adaptations could include the time of day when an animal is active or the type of food it eats. Plants have a very limited behaviour so this mostly applies to animals
- Features develop that help the organisms to survive, so if similar organisms live in different environments they will adapt in different ways.
- Adaptation to the environment
- DNA
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