In the realm of genetics, the study of genes and their functions forms the cornerstone of understanding biological inheritance and variation. This document delves into the topic of genes as outlined in the International Baccalaureate (IB) Biology syllabus, specifically focusing on key concepts such as the nature of genes, alleles, mutations, and genomes.
A gene is a segment of DNA that contains the necessary information to produce a specific polypeptide. These polypeptides, in turn, influence various characteristics of an organism. For instance, the gene coding for the enzyme trypsin affects digestive processes.
A gene is a heritable factor, meaning it can be passed from parent to offspring during reproduction.
For example, the gene responsible for blood group in humans has different alleles that result in blood types A, B, AB, or O.
Each gene occupies a specific location on a chromosome known as a locus (plural: loci). This precise positioning ensures that the gene for a particular characteristic is consistently found at the same location across individuals of a species.
Alleles are alternative forms of a gene that exist at the same locus on homologous chromosomes. While they code for the same trait, different alleles can produce variations of that trait.
Although alleles are different forms of the same gene, they still occupy the same locus on the chromosome.
The ABO blood group system in humans is determined by three alleles: $I^A$, $I^B$, and $i$. These alleles combine to produce four possible blood types: A, B, AB, and O.
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