Read the statements. In eukaryotic organisms, genes usually consist of two alleles. The two alleles are often on different parts of the same chromosome.

These sentences contain incorrect information. Which option describes the mistake?

a. In eukaryotic organisms, the two alleles of the gene are joined end to end on the same chromosome. In eukaryotic organisms, the two alleles of the gene are joined end to end on the same chromosome.

b. In eukaryotic organisms, genes usually consist of a single allele. In eukaryotic organisms, genes usually consist of a single allele.

c. In eukaryotic organisms, genes are usually spread over four or more chromosomes. In eukaryotic organisms, genes are usually spread over four or more chromosomes.

d. In eukaryotic organisms, the two alleles of the gene are on different chromosomes.