Gene locus is defined as

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Prepare for the Leaving Cert Biology Genetics exam with diverse question sets, detailed explanations, and clear learning goals. Enhance your understanding of genetics concepts comprehensively to excel in your exams.

Multiple Choice

Gene locus is defined as

Explanation:
A gene’s locus is the exact position on a chromosome where that gene is located. This fixed location is what geneticists use to map genes, compare them across individuals, and study inheritance, since each allele occupies the same locus on homologous chromosomes. It isn’t restricted to tRNA genes—any gene has a locus. It isn’t the starting point of DNA replication (the origin of replication), and it isn’t the collection of all genes (the genome). So the locus uniquely defines where a gene sits on the chromosome.

A gene’s locus is the exact position on a chromosome where that gene is located. This fixed location is what geneticists use to map genes, compare them across individuals, and study inheritance, since each allele occupies the same locus on homologous chromosomes. It isn’t restricted to tRNA genes—any gene has a locus. It isn’t the starting point of DNA replication (the origin of replication), and it isn’t the collection of all genes (the genome). So the locus uniquely defines where a gene sits on the chromosome.

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