In the human pedigree on right, the
filled symbols represent affected individuals.

a) Is this disease most likely a
dominant or recessive trait? Please briefly justify your
answer.

b) State the genotypes of three
individuals (6-8) above. Please use the letter “A” and “a” to
represent the dominant and recessive alleles of the gene carrying
the disease, respectively.

#6:
____________          
#7:
___________         
#8: _____ ______

c ) If individuals #6 and #7 have
another son, what are the chances that this son will be affected?
Please also briefly justify your answer.