Evolution by Natural Selection Unit 6

Evolution Evolution is the alteration and diversification of life over time. The prevailing explanation as to how modern biodiversity developed from early life is Evolution by Natural Selection

Survival of the Fittest Under the theory of natural selection, organisms are subject to “survival of the fittest” conditions. “Fitness” in this case refers to an organism’s ability to mature and reproduce within its environment. It is survival of the fittest GENES

Natural Selection Natural Selection states that the fittest organisms will survive longer and reproduce more often, resulting in their genes becoming more prevalent within the population. This is the mechanism which directs the course of evolution.

Antibiotics When using antibiotics, not all the bacteria can be killed. The only bacteria to survive are those with a genetic variance or mutation that codes for resistance to that antibiotic.

Antibiotics This means that after some time, the only bacteria left in a population will be those resistant to our medicines. These are generally called super bugs.

Antibiotics Since animal agriculture uses antibiotics constantly, this is starting to become a more dire global situation.

Lamarck’s Acquired Traits Before Charles Darwin established his theory of Natural Selection, in 1859, the prevailing theory explaining evolution was from Jean Baptiste Lamarck. In 1801 Lamarck presented the Theory of Inheritance of Acquired Characteristics

Lamarck’s Acquired Traits Lamarck proposed the idea that an individual organism’s acquired traits were passed to offspring. Acquired traits are those gained within an individual organism’s lifetime. If this were the case, working out would mean your children would be more muscular

Evolution and the Environment

Evolution and the Environment

Natural Selection Environmental Pressure and Competition are the driving forces behind speciation: the development of new species from an existing one.