Final answer:
Without the image of the pedigree provided, the mode of inheritance of the trait cannot be determined. Normally, dominant traits do not skip generations while recessive traits can, but this is not conclusive without the pedigree.
Step-by-step explanation:
To determine the mode of inheritance of a trait using a pedigree, one needs to examine the pattern through which the trait is passed on through generations. If the trait does not skip generations and each affected individual has at least one affected parent, the trait is likely dominant. However, if the trait can skip generations and appears among siblings without appearing in their parents, it is likely recessive. It is important to look at how the shaded individuals (those exhibiting the trait) are related to unshaded individuals in the pedigree.
For a trait controlled by a single gene with two alleles in Mendelian inheritance, the trait is considered dominant if only one copy of the allele is required for the trait to be expressed (heterozygous or homozygous dominant). It is called recessive if two copies of the allele (homozygous recessive) are needed for the trait to be exhibited. The description of the pedigree provided in the question does not allow for a definitive conclusion regarding the mode of inheritance without more context. Therefore, without the pedigree image, the correct answer would be 'Cannot be determined.'