Allele, Recessive allele, Dominant allele, Back cross
Allele: Alternative form of a single gene in a locus.
Recessive Allele: Allele whose phenotypic effect is not expressed in the presence of its alternative allele.
Dominant Allese: Allele in which phenotypic effect is expressed in heterozygotes.
Back Cross: Cross between F1 offspring with P1.
