Some useful sites to understand more of the medical science:

About Genetics:–

• What is a Genetic Disorder?
• https://www.yourgenome.org/ Discover more about DNA, Genes and Genomes and the implications for our health and society.
• Learn Genetics  (University of Utah)
• DNA from the beginning – An Animated Primer of 75 Experiments that made modern genetics
• About Stem Cells  (University of Minnesota)