Open jars Covered jars Constant Rotting meat Observations Flies entered jars, landing on the meat Flies were unable to enter the jar Results Maggots developed on meat No maggots developed on meat Conclusions The maggots came from the flies, NOT the meatġ5 Biogenesis After the discovery of the microscope and thus the discovery of microorganisms, Redi’s work was called into question. He developed a controlled experiment to test his hypothesis that life must come from life (biogenesis)ġ4 Redi’s Experiment Control Grp Experimental Grp Independent variable For example, it was a commom belief that fish arose from the mud in the bottom of a river.ġ3 Biogenesis Francesco Redi set out to disprove the theory of spontaneous generation/abiogenesis. For a long time people believed that nonliving material could produce living things (spontaneous generation). Biogenesis is the continuation of life from other living cells. This experiment has been replicated numerous times.ġ0 Fill It In … What was found in the “primordial soup”?ġ1 Biogenesis Once life was established in very simple cells, biogenesis began. Up to 4% of the carbon was converted to amino acids (the building blocks of proteins). This supports the idea that life originated as a “primordial soup” in the oceans.ĩ Early Environment Miller and Urey designed an experiment to test Oparin’s “primordial soup” hypothesis They were able to successfully mimic the proposed conditions of early earth in the laboratory. His theory hypothesized that due to the chemicals in the atmosphere, the lack of free oxygen, and intense energy from lightning and volcanoes, simple organic molecules could form from inorganic compounds.Ĩ Early Environment At this time in the earth’s history, the earth was covered by water Therefore, this essential first step in the development of life must have occurred in the oceans. This idea is sometimes called spontaneous generation.Ĥ Early Environment The environment of the early Earth may have provided a unique set of conditions that allowed abiogenesis to occur.ĥ Early Environment Researchers now believe that the early atmosphere may have been similar to the vapors given off by modern volcanoes: carbon monoxide, carbon dioxide, hydrogen sulfide, and nitrogen (note the absence of free atmospheric oxygen).ħ Early Environment Oparin developed a theory to explain the development of life on earth.
Origins of Life How could life have begun on a lifeless planet?Ībiogenesis is the idea that life came from non-living material. 1 How could life have begun on a lifeless planet?
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