If a population is extremely sensitive to environmental conditions, even a small change in the environment can spell disaster for the population.
If a population declines suddenly and the only changes noted have been environmental fluctuations, the cause of the decline is most likely associated with these conditions.
Sudden changes in environmentally sensitive populations can be indicators of environmental problems that go beyond the species in question.
<span>The study of how traits are inherited though the interaction of alleles is defined as genetics and it began in the 1850's. Gregor Mendel was the first scientist to study genetics. </span>
