Question

Multiple alleles are present
A) On nonsister chromatids
B) At the same locus of the chromosome
C) At different loci on the same chromosome
D) On different chromosomes

Answer 1

A gene's allele is one of two or more variants. For each gene, an individual inherits two alleles, one from each parent. The individual is homozygous for that gene if the two alleles are identical.

Complete answer:
Alleles are genetic pairings that share a specific location on a chromosome called a locus. In a diploid organism, a gene typically has just two alleles. Multiple allelism is a condition in which a gene exists in more than two allelic variants. Allelism refers to any of a gene's many variants. Hereditary variations are caused by these genetic variances, which are frequently caused by mutation.
Multiple allelism, in particular, is defined as the presence of three or more alleles of a gene. As a result, numerous alleles refers to the presence of three or more alleles for a given gene. The ABO blood group system in humans is the best example of multiple allelism.
Alleles are genetic pairings that share a specific location on a chromosome called a locus. In a diploid organism, a gene typically has just two alleles. Multiple allelism is a condition in which a gene exists in more than two allelic variants.
Multiple alleles are the presence of more than two alternative forms of a gene that should be accommodated on two loci on a homologous pair. This is made easier by the presence of multiple alleles on the same chromosome locus, as long as only one allele is present at a time.

As a result, option B is the correct answer.

Note:
Multiple alleles in a population occupying the same locus on a chromosome or its homologue are known as multiple alleles in a population. Multiple alleles express different variants of the same characteristic. Codominance, dominance-recessive behaviour, and incomplete dominance can all be seen in different genotypes.