Answer :
Alleles are alternate versions of gene(s) that have **small differences in their nucleotide sequences**.
Alleles represent the various forms that a particular gene can take within a population. Genes code for specific traits and characteristics, and these alternate versions of a gene, or alleles, arise due to variations in their nucleotide sequences. Each allele carries a distinct set of instructions, resulting in variations in the trait it controls.
The term "small differences in their nucleotide sequences" accurately captures the nature of allelic variation. While alleles might share a common core structure, even minor changes in nucleotides can lead to significant differences in the protein or RNA molecule they encode. These changes can result in variations in traits such as eye color, height, or disease susceptibility.
The phrase "small differences" acknowledges that alleles may differ by just a few nucleotides, yet these differences can have substantial impacts. For example, a single nucleotide change can lead to the presence or absence of a specific protein domain, altering the function of the protein it codes for. These variations are essential for genetic diversity within a population and underlie the basis of evolution and adaptation.
In conclusion, the phrase "small differences in their nucleotide sequences" concisely captures the essence of allelic variation, emphasizing that even subtle changes can give rise to significant differences in traits, contributing to the diversity of life.
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