Question

Which statement best describes two different alleles for the same gene?

A. They are found in different locations on a chromosome but code
for exactly the same amino acids.
OB. They are found at the same location on a chromosome but have
very different sequences of nitrogenous bases.
OC. They are found in the same location on a chromosome but have
slight differences in their sequences of nitrogenous bases.
D. They are found in different chromosomes and code for very
different sequences of amino acids.

Answer 1

C. They are found in the same location on a chromosome but have slight differences in their sequences of nitrogenous bases.

An allele is a variant form of a gene that arises by mutation and is located at the same position on a specific chromosome. Since the alleles are located on the same chromosome, they are in the same location, but they have slight differences in their sequences of nitrogenous bases. These differences in the base sequence can lead to differences in the amino acid sequence of the protein that the gene encodes, or they may have no effect on the protein at all. Therefore, option C is the statement that best describes two different alleles for the same gene.