As evident from the pedigree, dominant traits never skip a generation.
Recessive traits skip generations.
If an affected individual has unaffected parents, the trait is recessive as one of them must be the carrier (heterozygous) but does not have the disease.
Therefore, considering all the above criteria, this is definitely a dominant trait.
Distinction between autosomal and X-linked Pedigrees:
Autosomal traits affect both males and females equally.
X-linked recessive traits are more likely to affect males than females.
X-linked dominant traits are more likely to affect females. But if a male is affected, all of his daughters will be affected but all his sons will be healthy.
Considering above criteria, the trait is autosomal.
Therefore, the pedigree represents an autosomal dominant trait.
