Question

what are allels or allelomorphs

Answer 1

An allele is a variant form of a given gene. Sometimes, different alleles can result in different observable phenotypic traits, such as different pigmentation.

Answer 2

An allele is a variant form of a gene.

eg; gene for blossom color in many species of flower — a single gene controls the color of the petals, but there may be several different versions (or alleles) of the gene.