The possible genotypes of the parents can vary. if you put these genotypes in a punnet square you can see the possibilities of the child having Marfan Syndrome. The chances of a person with Marfan Syndrome passing the disease down to his or her child can vary from 50% to 100%. Here is a chart that will show the possible genotypes and the percentage chance that the baby will have Marfan Syndrome...
M = Regular Gene m = Marfan Syndrome
Percentage chance of child
Parents: Father: Mother: having Marfan Syndrome:
Genotypes: MM MM 100%
MM Mm 100%
Mm MM 100%
MM mm 100%
mm MM 100%
Mm Mm 75%
Mm mm 50%
mm Mm 50%
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