The contrasting pairs of factors in Mendelian crosses are called

Answer: Option C

The contrasting pairs of factors in Mendelian crosses are called Allelomorphs.
Allelomorph is (genetics) one of several alternative forms of the same gene occupying a given position on a chromosome.
An allele also termed an allelomorph that is any one of two or more genes that may occur alternatively at a given site (locus) on a chromosome.
Alleles may occur in pairs, or there may be multiple alleles affecting the expression (phenotype) of a particular trait.