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.
Dictionary. Definition of allele. one of two alternate forms of a gene that can have the same locus on homologous chromosomes and are responsible for alternative traits; some alleles are dominant over othersSimilar Words: allelomorph Anagrams: lee(a). Similar Words: allelomorph Anagrams: lee(a).