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.
Mitochondrial Haplogroup H. Mitochondrial haplogroup H is a very common and diverse mitochondrial lineage among populations in Europe, the Near East and the Caucasus region. The lineage is likely to have evolved around 25,000 years ago in West Asia, before being transported into Europe.itochondrial haplogroup H is a very common and diverse mitochondrial lineage among populations in Europe, the Near East and the Caucasus region.