Final answer:
The fact that inheritance of attached earlobes is not influenced by the inheritance of a gene for tongue rolling in humans is evidence of the law of independent assortment.
Step-by-step explanation:
In humans, the inheritance of attached earlobes not being influenced by the inheritance of a gene for tongue rolling is evidence of the law of independent assortment. This law states that different genes and their alleles are inherited independently of each other. This means that the inheritance patterns of one trait will not affect the inheritance of another trait, unless the genes are linked on the same chromosome, which is not the case with the genes for earlobe attachment and tongue rolling.