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The heterotroph hypothesis is one explanation or theory of evolution and the order of life on Earth.
Primitive Earth is thought to be very hot, humid and treacherous. Its believed that it had conditions unfit for human life, due mainly to the atmosphere. The gases in the air were methane and ammonia. There was no oxygen or carbon dioxide. The atmosphere was also weak, allowing harsh ultra violet rays through.
Miller's experiment supported the theory that organic compounds such as amino acids, which are necessary for cellular life, could be created simply with the conditions that were said to be present on primitive earth.
Heterotrophs are organisms that do not have the ability to produce their own food.
Autotrophs are organisms that can produce their own food, normally using photosynthesis
Chemosynthesis, the process in which carbohydrates are made from carbon dioxide and water and uses chemical nutrients as an energy source, is an alternative to photosynthesis.
Anaerobes are any organisms that do not require oxygen for growth.
Aerobes are organisms that need oxygen to grow and thrive.
One of the flaws in the heterotroph hypothesis is that it does not include RNA's role. Therefore RNA has no affect on this hypothesis.
Role of Meiosis/ Sexual reproduction
Since the creation of the ozone layer and the addition of oxygen in the atmosphere, variation and mutation decreased due to the lack of radiation. Meiosis has made up for it because it provides variety. It also subtracts, adds or changes genes in organisms allowing sexual reproduction to occur.
The conditions on the Earth at the time would only allow for the organisms to come in a specific order.
Proteins make up cells and cells are what we have in common with organisms from primitive Earth. They are the basic building blocks of life.
1. Heterotrophs that could perform anaerobic respiration. These organisms created carbon dioxide.
Protein synthesis is the process of making proteins. Primitive life would not have existed without it. It is a way to connect modern organisms to life long ago.
2.Autotrophs that could perform anaerobic respiration. Through photosynthesis, these organisms created oxygen.
3. Heterotrophs and Autotrophs that could perform aerobic respiration.
http://johnkyrk.com/evolution.swf
Here are some modern day heterotrophs in their natural habitat
http://prezi.com/5kzropua6_0w/evolutionheterotroph-hypothesis-by-felix-g-lizeth-s/
Modern Biology Textbook
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