Assorted References. 1  major reference (in heredity (genetics): Polyploidy) 2  chromosome number (in chromosome number) 3  description (in ploidy) (in heredity (genetics): Polyploids) 4  occurrence in mutation (in mutation (genetics))
This is the complete list of the thirty-three amendments to the United States Constitution which have been proposed by the United States Congress and sent to the states for ratification since the Constitution was put into operation on March 4, 1789.
Of the 33 amendments proposed by Congress, 27 were ratified. Of the amendments ratified, only oneâthe Twenty-First Amendment, which repealed a Prohibition on alcoholâwas ratified by the state convention method.The rest have been ratified by three-fourths of the state legislatures.The process for amending the Constitution is deliberately difficult. Even when an amendment is proposed by Congress, it has taken, on average, two-and-a-half years for it to be ratified.f the 33 amendments proposed by Congress, 27 were ratified. Of the amendments ratified, only oneâthe Twenty-First Amendment, which repealed a Prohibition on alcoholâwas ratified by the state convention method.