How many different alleles of a given gene can a diploid individual maximally carry

A gene can have different forms called alleles. These alleles can be dominant or recessive, heterozygous or homozygous. A diploid individual has two copies of chromosome one that came from a male parent and one from the female parent.  

As a diploid individual have two copies of homologous chromosome and each chromosome can carry only one allele of a gene, therefore, the two homologous chromosomes can carry only 2 alleles of a gene.

These alleles are present at the same locus on the chromosome and the dominant allele express itself in the phenotype. Recessive allele can only be expressed if both the chromosome have recessive allele(homozygous condition). So 2 different alleles of a given gene a diploid individual can maximally carry.

The correct answer will be- two alleles at same locus.

Explanation:

Diploidy is a condition represented by the two sets of chromosomes on an organism receiving one set of the chromosome from one parent.

The alleles represent the variable form of a gene which determines the trait of an organism. The alleles show is affected in organisms only when two corresponding alleles from each parent come together and shows their equivalent response in diploid organisms.

Since the diploid organism contains tow sets of organisms from each parent therefore, an diploid organism contains a maximum of two alleles at the same position or locus.