Income Exclusion Rule. DEFINITION of 'Income Exclusion Rule'. A rule that sets aside certain types of income as nontaxable. There are many types of income that qualify under this rule, such as life insurance death benefit proceeds, child support, welfare and municipal bond income. Income that is excluded is not reported anywhere on Form 1040.
Ancestral vs derived alleles. An ancestral allele or an ancestral trait (depending on whether you look at the phenotype or a t the genotype) is the trait/allele that was carried by the common ancestor of the taxon you consider.
Ancestral traits are things that you receive from people other than your parents or grandparents. They mainly consist of things like eye color or hair color. Sometimes even sk â¦ in color.ncestral traits are things that you receive from people other than your parents or grandparents. They mainly consist of things like eye color or hair color. Sometimes even sk â¦ in color.