Final answer:
The trait likely follows an X-linked recessive pattern since the daughter is affected but the parents are not, suggesting that the mother may be a carrier and the daughter inherited the recessive allele from both parents.
Step-by-step explanation:
If a pedigree shows that a male and female are not shaded but their daughter is shaded, the possible mode of inheritance for this trait is likely to be X-linked recessive. This is because both parents appear unaffected, meaning they do not express the trait, yet they have an offspring that does. In X-linked recessive inheritance, males have only one X-chromosome, so the expression of the trait with a single recessive allele is assured, while females have two, meaning an affected daughter must have inherited the recessive allele from both parents. Given that the parents are unaffected, it's conceivable that the mother could be a carrier of the recessive allele (heterozygous) and the father has a normal X-chromosome. The daughter must have inherited the affected X-chromosome from her mother and the father's single X-chromosome also carrying the recessive allele, resulting in the shaded phenotype.