Two months ago my dad got a blood clot in his leg. His calf got huge! Add in the pain and they knew something wasn't right. They put him on blood thinners and sent him home. After a few weeks he found out he had a mutant DNA gene that is named Leiden Factor V. He is hetro, which means he has one normal gene and one mutant gene. This mutant gene (which is a dominant gene) gives him a 7% increase chance of getting a blood clot. So now we know why he has the clot.
We were so relieved to find out that he only had one. This meant us as children had less of a chance to inherit this mutant gene. I found this great chart that tells what chance you have of inheriting the gene if your parents have it. I found it at http://www.fvleiden.org/ask/12.html.
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