Ariel's father is most likely heterozygous (since only one of his parents had the disease) and her mother is most likely homozygous recessive (since

Ariel's father is most likely heterozygous (since only one of his parents had the disease) and her mother is most likely homozygous recessive (since no one in her family has ever had the disease) Complete the Punnett Square and be sure to state what each letter (capital vs lowercase) represent.

What percentage chance is there that Ariel has the disease causing allele?