Genetics Vocabulary in English

Genetics is the scientific study of genes, heredity, and how characteristics pass from parents to offspring. It explains why family members share features and how variation arises within and between species. Genetics ranges from the structure of DNA to the way whole populations change over generations, and it underpins much of modern biology, medicine, and agriculture.

A gene is a single unit of heredity that carries instructions for a particular characteristic, such as eye colour. The genome is the complete set of all an organism's genetic material, including every gene and the DNA between them. So a gene is one instruction, while the genome is the whole instruction book. The human genome contains around twenty thousand protein-coding genes.

DNA, short for deoxyribonucleic acid, is the molecule that stores genetic information in nearly all living things. It is shaped like a twisted ladder, often called a double helix, and its sequence of chemical letters spells out the instructions in our genes. DNA is packaged into structures called chromosomes inside cells, and it is copied and passed on when organisms reproduce.

A dominant gene shows its effect even if a person has only one copy of it, while a recessive gene shows its effect only when a person has two copies, one from each parent. For example, brown eyes are usually linked to a dominant allele and blue eyes to a recessive one. This is why a recessive trait can skip generations and appear unexpectedly.

A mutation is a change in the DNA sequence. Some mutations have no effect, some are harmful and can cause disease, and a few are beneficial and help an organism survive. Mutations are also the ultimate source of genetic variation, which evolution acts upon. They can be inherited from a parent or arise spontaneously during the copying of DNA.

Your genotype is your genetic make-up, the actual set of genes you carry. Your phenotype is the set of observable characteristics that result, such as height, eye colour, or blood type. The phenotype is shaped by both the genotype and the environment, which is why two people with similar genes can still differ if they grow up in different conditions, for example with different diets.

A carrier is a person who has one copy of a recessive gene for a condition but does not show the condition themselves. Because the gene is recessive, it has no effect unless paired with a second copy. However, two carriers can pass the condition to their children if both contribute the recessive allele. This is why genetic counselling is helpful for some hereditary conditions.

Genetic engineering is the deliberate alteration of an organism's genes using laboratory techniques. It can add, remove, or change DNA to give an organism new characteristics, such as crops that resist disease or bacteria that produce medicines. It is a powerful tool in medicine, agriculture, and research, and it raises important ethical and safety questions that societies continue to debate.

Yes, especially for B2 to C1 learners interested in biology, medicine, or current affairs. Genetics appears constantly in the news, from health and food to ancestry testing. Understanding words such as gene, DNA, and inheritance helps you follow these stories. The vocabulary also gives excellent practice for the precise, formal language valued in exam reading and academic writing.

Start with the accessible core: gene, DNA, inheritance, trait, variation, and offspring. These let you follow most popular science. At higher levels, add the more technical terms: chromosome, genome, mutation, dominant, recessive, genotype, and phenotype, which allow you to understand and discuss how heredity actually works.