Question

Allelism refers to

• A. genic interactions controlling a character
• B. multiple genes controlling a character
• C. expression of many characters by a single gene
• D. alternative forms of a gene at a given locus

Answer 1

Answer: (D)

Allelism refers to presence of alternative forms of a gene at a given locus. Alleles or allelomorphs are the two contrasting aspects of the same character present at a locus of homologous pair of chromosomes. Now-a-days, the same aspect in duplicate (TT or tt) of a character is also considered an allele.