Q. Multiple alleles are present :
(a) On sister chromatids
(b) On different chromosomes
(c) At different loci on the same chromosome
(d) At the same locus of the chromosome
Solution :
Correct option : D Multiple alleles refer to the presence of more than two alternate forms of a gene which should be accommodated on two loci on a homologous pair. This is facilitated by the presence of more than one allele on the same locus of a chromosome provided one allele is present at a locus at a time. Thus, the correct answer is option D.