Wendys mother has blue eyes and her father has brown eyes. the allele for brown eye color is dominant (b) to the allele for blue eye color (b), but wendy has blue eyes. therefore, wendys must be and her fathers must be bb.

The allele for browneye (Bb) is dominant and is present in the father.
Wendy's mother has blue eyes, the allele of which is recessive and therefore, must be homozygous to express itself. So, Wendy's mother must be (bb), and his father must be (Bb).
Wendy is, therefore, (bb), as he has blue eyes and received recessive allele b, from both of his parents.

If the experiment was perfomed more then once and you get the same results