See related link on biostatistics.
You can probably find many applications in the internet. Biology spans many different fields, and within each of these fields, there are applications of statistics. Biostatistics defined as:
The science of biostatistics encompasses the design of biological experiments, especially in medicine and agriculture; the collection, summarization, and analysis of data from those experiments; and the interpretation of, and inference from, the results.
Beyond biostatistics, there is bioinformatics, which is the application of probability theory and statistics on molecular biology. This is the application involving DNA studies. which you can find more information on the internet.
Very current are statistical applications in epidemiology (swine flu epidemic), but epidemiology encompasses all diseases, plants, animals and humans.
Ecological and environmental studies, such as the impact of drilling in sensitive areas, or the effects of urbanization require statistical analyses. This is generally the impact of human activities which have a potential to upset natural processes. Another application, global warming requires statistical analyses, related to the modeling of natural systems.
Medicine including pharmacuetical and medical research studies (evaluation of new drugs and procedures) also require statistical analyses. There is always a risk that a new drug may be ineffective or worse, cause harm in some of the people seeking treatment. Drugs can only be approved if they are shown in tests to be a better treatment or the same treatment at less expense or harmful side effects than existing drugs.
There are numerous other applications, which you may find through reviewing links on the internet.