According to the evolution, man was a hunter in the earlier days and required to wander. The population density was very low and people were in smaller groups. The productivity rate was low and there was less contact with animals. He started to cultivate crops for survival, which enabled him to be stationary. These changes lead to increase in population and thus human-to-human contact. These settlements also increased the contact with animals as he started to domesticate them for various purposes. The increase in concentration of contagious agents from animals and stored agricultural wastes increased the chances of infectious diseases.
Describe the experiments of Louis Pasteur and explain how they disproved the idea of spontaneous generation.
Louis Pasteur in 1860 and 1864 conducted an experiment to disprove the idea of spontaneous generation. He exposed freshly boiled nutrient broth to air in vessels that contained a filter to stop all the particles passing through to the broth and even with no filter too, with air being introduced through a long tube that would not pass dust particles, nothing grew proving that microorganisms entered from outside and not generated spontaneously in side the broth thus, proving the germ theory.
What are zoonotic infections Is this only something that happened during Agricultural Revolution
Zoonotic infections are infectious diseases that are transmitted from animals (wild and domestic) to humans. The increase in population density and contact with animals (wild and domestic) increased the chances of infection. But this infectious disease is not limited to that era. Many modern diseases started as zoonotic diseases. There are evidences that measles, smallpox and HIV came to humans this way. The increased contact with the animals can be due to encroachment of human activity into wilderness or by movements of animals in human environment.
What are some of the pros and cons of an agriculturalfarming lifestyle versus a hunter gatherer culture
ProsConsHunter gathered cultureSmall group of people(150)
Less density of population
Less contact with animals
No storage of foodNo settlement
Less populationFarming style lifestyleMore food
Food storage
Less LaborPopulation density increased
Contact with animals increased
Storage of food
Spread of zoonotic diseases
Explain three reasons why a defective gene might be maintained in the population.
Defective gene might be maintained in the population as results from the constant exposure of human to viruses, bacteria, protozoa and micro parasites. Defective gene is transferred genetically in the population. The mutation may happen due structural changes (Astrocytoma), functional changes (Marfan syndrome) and by inheritance (Hemophilia).
Describe the experiments of Louis Pasteur and explain how they disproved the idea of spontaneous generation.
Louis Pasteur in 1860 and 1864 conducted an experiment to disprove the idea of spontaneous generation. He exposed freshly boiled nutrient broth to air in vessels that contained a filter to stop all the particles passing through to the broth and even with no filter too, with air being introduced through a long tube that would not pass dust particles, nothing grew proving that microorganisms entered from outside and not generated spontaneously in side the broth thus, proving the germ theory.
What are zoonotic infections Is this only something that happened during Agricultural Revolution
Zoonotic infections are infectious diseases that are transmitted from animals (wild and domestic) to humans. The increase in population density and contact with animals (wild and domestic) increased the chances of infection. But this infectious disease is not limited to that era. Many modern diseases started as zoonotic diseases. There are evidences that measles, smallpox and HIV came to humans this way. The increased contact with the animals can be due to encroachment of human activity into wilderness or by movements of animals in human environment.
What are some of the pros and cons of an agriculturalfarming lifestyle versus a hunter gatherer culture
ProsConsHunter gathered cultureSmall group of people(150)
Less density of population
Less contact with animals
No storage of foodNo settlement
Less populationFarming style lifestyleMore food
Food storage
Less LaborPopulation density increased
Contact with animals increased
Storage of food
Spread of zoonotic diseases
Explain three reasons why a defective gene might be maintained in the population.
Defective gene might be maintained in the population as results from the constant exposure of human to viruses, bacteria, protozoa and micro parasites. Defective gene is transferred genetically in the population. The mutation may happen due structural changes (Astrocytoma), functional changes (Marfan syndrome) and by inheritance (Hemophilia).
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