Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Politics : Sharks in the Septic Tank -- Ignore unavailable to you. Want to Upgrade?

To: Neocon who wrote (71893)	8/6/2003 4:37:47 PM
From: epicure	Read Replies (1) \| Respond to of 82486

Malaria- endemic in the tropics I had a fascinating course in parasitology find 100's of references by searching under "sickle cell beneficial malaria" "Adaptation and Adaptive Strategy The earth is rich in diverse environments and eco-systems. At the core of evolution is the way a specific species adapts to its environment. An example in humans is sickle cell anemia. In North America, sickle cell anemia is uncommon and a disadvantage. However, in other parts of the world, specifically areas where malaria is common, the occurrence of sickle cell anemia is greater. Why? Because the heterozygous Sickle Cell Anemia genotype gives a higher resistance to malaria, however a homozygous genotype is still a disadvantage. Adaptation occurs on many levels. Another adaptive trait of humans is body size. While body size is generally very subjective, it is an adaptive trait that people in southern, tropical, or warm climates are taller than those in colder, northern, or arctic climates. The reason behind the adaptation is the distribution of heat throughout the body. A taller person in a hot climate distributes heat throughout a larger percent of their body to disperse it easier, whereas a shorter person in a northern climate has a smaller body in which to distribute heat which helps to retain it. Other adaptations with other organisms follow the same general premise. All adaptations are a consequence of the environment, and are meant to help an organism survive within that environment. This is known as the Adaptive Strategy of an organism" emuseum.mnsu.edu