"Many creationists believe that the bulk of scientific evidence for a recent creation comes from the fields of geology, physics, and astronomy and that biology and genetics have little to contribute. However, data that confirm a young creation are rapidly emerging from genetic studies performed by both creationist and secular scientists" http://www.icr.org/article/genetic-entropy-points-young-creation
The book "Genetic Entropy" by Dr. Sanford (4th Edition) is an important read on this subject.