Embedded Files
Aren't mutations BAD?!
- Some mutations are in fact harmful, affecting the function and structure of important proteins, and thereby decreasing the chances of survival for that organism. Your cells have many mechanisms in place to try to avoid mutation and repair any changes to your genetic code.
- Some mutations go unnoticed! Some mutations actually have no impact on coded proteins, and therefore are neither harmful nor helpful to an organism.
- AND... SOMETIMES... mutations actually change a gene in a way that gives an organism an ADVANTAGE for survival.
- Mutations that results in favorable variations drive the evolution of a species. Over time, the favorable variations increase in frequency in the population due to natural selection.
Evolution of antibiotic resistance in bacteria.
Evolution of antibiotic resistance in bacteria.
- Bacteria reproduce very quickly. In our lifetimes, we have seen bacteria evolve resistance against antibiotic treatments.
- Don't forget- the only way for variations to be present in a population of asexual organisms is through random mutation.
- Watch the video to see how antibiotics "select" for resistant genes over and over again
- By the same process, insects can develop resistance to pesticides and plants can develop resistance against herbicides.
Evolution of the white polar bear
Evolution of the white polar bear
- Watch this video to learn about how SOMETIMES, a random mutation in the genetic code can result in a trait that is FAVORABLE. Such mutations give organisms a greater chance of survival and drive the evolution of a population over time.
- This video describes the evolution of the polar bear from the brown bear.
- Don't forget- mutations can only be passed on through sexual reproduction if the mutation is present in the gametes!
Page updated
Google Sites
Report abuse