Draw out a pedigree for the following information:
A set of parents are free from this disease. They have two children, a boy with the disease and a girl without the disease.
The boy gets married and has a boy and a girl free from the disease. The girl also get married and has three boys. Two of them
have the disease.
As best you can, determine the mode of inheritance for this disease. (Is it autosomal or on the X chromosome? Is it dominant or
recessive?) Justify your claim with evidence from your pedigree.