Question

Sol.(b) [Key Concept: Alleles — Alternative Molecular Forms of Gene] ALLELES are DIFFERENT MOLECULAR FORMS of a GENE — alternative forms of a gene that occupy the same locus on homologous chromosomes and differ in their nucleotide sequences. They encode the same trait but may produce different phenotypes (e.g., T and t are alleles for stem height in pea). Alleles arise by mutation of the original gene. Multiple alleles (more than 2) can exist in a population, though each individual has only 2 (in diploid organisms).