Alleles: A group or pair of genes that determine a particular characteristic of an organism.
Recessive trait: Traits that are suppressed and are unexpressed in the successive generations. These traits might be masked in the first generation and might reappear in the second generation. Alleles for recessive traits: tt, rr, ww, bb etc.
Dominant trait: Traits that appear in successive generations. These traits appeared in every generation. Alleles for dominant traits: TT, RR, WW, BB etc.
