What is meant by an allele?

What is meant by an allele?

• A. Different form of a gene
• B. A type of protein
• C. A segment of DNA
• D. A chromosome

Answer: (A)

Alleles are different forms of the same gene that occupy the same position (locus) on homologous chromosomes. They arise by mutation and provide the genetic basis for variation in inherited traits. The best description is that an allele is a different form of a gene because it emphasizes that a single gene can exist in multiple versions, each potentially influencing a trait in its own way. An allele isn’t a protein itself, even though the version of a gene it represents may determine which protein is produced. It isn’t just any DNA segment, nor a chromosome, which is a much larger structure that contains many genes.

Alleles are different forms of the same gene that occupy the same position (locus) on homologous chromosomes. They arise by mutation and provide the genetic basis for variation in inherited traits. The best description is that an allele is a different form of a gene because it emphasizes that a single gene can exist in multiple versions, each potentially influencing a trait in its own way. An allele isn’t a protein itself, even though the version of a gene it represents may determine which protein is produced. It isn’t just any DNA segment, nor a chromosome, which is a much larger structure that contains many genes.