Changing Planet: Changing Mosquito Genes
DNA stands for deoxyribonucleic acid, which is a substance found in every living cell on Earth. Diversity happens naturally because of the way DNA is copied in the cell (sometimes the cell makes a mistake as it makes a copy of the DNA, and a "difference" is made).
Changes are constantly occurring in all species' DNA sequences, and the changes that have a positive effect on an organism tend to be passed on to the next generation. This is called natural selection, and it's the process that shapes life on Earth. It's important to remember that natural selection is still happening, and as a species encounters changes in its environment (like new climate patterns, new predators, or new prey), its DNA changes to adapt to its new situation (for instance, an insect that is being preyed upon by a new predator may adapt by changing its color so it is less easily seen by the new predator). This is easy to see in the example of the mosquitoes in this lesson, where a population of pitcher plant mosquitoes is adapting to climate changes by lengthening their growing season.
Click on the video at the left to watch the NBC Learn video - Changing Planet: Changing Mosquito Genes.
Lesson plan: Changing Mosquito Genes
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