The Standard Model is based on the internal symmetries of the unitary product group S U ( 3 ) C × × S U ( 2 ) W × × U ( 1 ) Y the members of which have a quite different nature. The color symmetry S U ( 3 ) C has the vectorlike structure due to which the lefthanded and righthanded quarks are transformed identically as its fundamental triplets. At the same time, the electroweak symmetry consisting of the weak isospin S U ( 2 ) W and hypercharge U ( 1 ) Y is chiral. So, the lefthanded components of all quarks and leptons are the S U ( 2 ) W doublets, Q L ( i ) = ( u c t d s b ) L L L ( i ) = ( ν ν e ν ν μ μ ν ν τ τ e μ μ τ τ ) L whereas their righthanded components are its singlets: U T ( i ) = ( u , c , t ) R D R ( i ) = ( d , s , b ) R N R ( i ) = ( N e , N μ μ , N τ τ ) R E R ( i ) = ( e , μ μ , τ τ ) R