Write a paragraph or make a PowerPoint to explain how genetic variation and environmental pressures can lead to change in an organism.
Write a second paragraph that describes an example of a plant or animal that has changed due to these factors. Include graphics or pictures.
How would you like us to help you with this assignment?
I honestly just need help with the first one. I don't really understand it.
http://www.google.com/#q=genetic+variation+and+environmental+pressures+can+lead+to+change+in+an+organism
To explain how genetic variation and environmental pressures can lead to change in an organism, I would suggest creating a PowerPoint presentation with the following key points:
1. Introduction: Start by defining genetic variation as the differences in traits and genetic information present within a population. Similarly, introduce environmental pressures as factors in the environment that can influence an organism's survival and reproduction.
2. Genetic Variation: Explain that genetic variation occurs through two primary mechanisms, mutation and sexual reproduction. Mutations are random changes in DNA that can introduce new genetic variations, while sexual reproduction shuffles and combines existing genetic variations.
3. Environmental Pressures: Discuss how environmental pressures, such as changes in temperature, availability of resources, or predation, can impact an organism's survival and reproductive success. Emphasize that some individuals within a population may possess traits or genetic variations that better equip them to cope with these pressures.
4. Natural Selection: Describe how the interaction between genetic variation and environmental pressures leads to the process of natural selection. Individuals with advantageous traits that enhance their survival and reproductive success are more likely to pass on their genes to the next generation.
5. Evolution: Highlight that over time, natural selection can result in the accumulation of beneficial traits within a population, leading to the emergence of new species or significant changes in existing species.
For the second paragraph, choose a specific example of a plant or animal that has undergone significant changes due to genetic variation and environmental pressures. For instance, you may explain how the peppered moth (Biston betularia) is a classic example of evolution. The moth's coloration shifted over time due to industrialization. Include graphics or pictures illustrating both the light-colored and dark-colored variations of the moth, along with the environmental changes that drove this adaptation. This visual aid will help enhance the understanding of how genetic variation and environmental pressures can drive changes in an organism.