Bottleneck is the term used to define chance changes in the frequency of alleles which have a significant effect on small populations. The effect is that the population is greatly reduced because of the change in the allele frequency. A genetic drift will follow which will expedite evolution.
How does the shape of orchids relate to gene expression?
Genes code for proteins. The genes an orchid get from its parents contol. how much of the two different types of proteins the flower makes. The shape of the orchid depends on the amount of each protein (L complex or SP complex) the flower has.
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Nonnative species often lack natural controls found in their native habitat.
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Sweating is the body's way of cooling itself. If you did not sweat, you could overheat the body and collapse from heat exhaustion.