Genetics Vocabulary in English
20 essential genetics vocabulary words with clear definitions and natural example sentences — ideal for B2–C1 learners interested in biology, science, and the language of heredity.
Genetics vocabulary describes how living things pass on characteristics from one generation to the next. Words like gene, DNA, and inheritance appear in biology lessons, news, and science writing, making them valuable for higher-level learners.
Because genetics underpins so much of modern biology and medicine, its vocabulary is both technical and widely used. Understanding terms such as chromosome, mutation, and dominant helps you follow science articles, health news, and documentaries with greater confidence.
These words form natural collocations: inherit a gene, carry a mutation, sequence the genome, pass on a trait, map the chromosomes. Learning these partnerships will help you discuss genetics clearly and confidently.
What You'll Learn
- 20 genetics vocabulary words in English with definitions and example sentences
- The difference between related terms such as gene vs genome and dominant vs recessive
- Key vocabulary for DNA, chromosomes, and inheritance
- Useful words for describing traits and variation
- Natural collocations to help you talk about genetics confidently
Essential Genetics Words
| Word | Meaning | Example Sentence | Level |
|---|---|---|---|
| genetics | the study of genes, heredity, and how characteristics are passed on | Genetics helps explain why children resemble their parents. | B2 |
| gene | a unit of heredity that carries instructions for a characteristic | A single gene can influence the colour of a person's eyes. | B2 |
| DNA | the molecule that carries genetic information in living things | DNA is shaped like a twisted ladder called a double helix. | B2 |
| chromosome | a thread-like structure of DNA that carries genes | Humans normally have 46 chromosomes in each cell. | C1 |
| genome | the complete set of genetic material in an organism | Scientists sequenced the entire human genome by 2003. | C1 |
| heredity | the passing of characteristics from parents to offspring | Heredity explains why some traits run in families. | C1 |
| inheritance | the way characteristics are received from one's parents | Eye colour is a classic example of genetic inheritance. | B2 |
| trait | a particular characteristic or feature of an organism | Height is a trait influenced by many different genes. | B2 |
| mutation | a change in the DNA sequence, which may alter a characteristic | A harmful mutation can sometimes cause disease. | C1 |
| dominant | describing a gene whose effect appears even with one copy | Brown eyes are caused by a dominant gene. | C1 |
| recessive | describing a gene whose effect appears only with two copies | Blue eyes result from a recessive gene. | C1 |
| allele | one of the alternative forms of a gene | Each parent passes on one allele for a given trait. | C1 |
| hereditary | passed from parents to children through the genes | Some diseases are hereditary and run in families. | B2 |
| genotype | the genetic make-up of an organism | Two people with the same genotype may still look different. | C1 |
| phenotype | the observable characteristics produced by genes and environment | Height is part of the phenotype, shaped by genes and diet. | C1 |
| variation | the differences in characteristics among individuals | Genetic variation helps a population adapt to change. | B2 |
| clone | an organism genetically identical to another | The scientists produced a clone of the original plant. | B2 |
| genetic engineering | deliberately changing the genes of an organism | Genetic engineering can make crops resistant to disease. | C1 |
| carrier | a person who has a gene for a condition but no symptoms | She is a carrier of the gene without being ill herself. | C1 |
| offspring | the young or descendants of a person, animal, or plant | Offspring inherit a mix of genes from both parents. | B2 |
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Frequently Asked Questions
What is genetics?
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.
What is the difference between a gene and a genome?
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.
What is DNA?
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.
What is the difference between dominant and recessive?
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.
What is a mutation?
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.
What is the difference between genotype and phenotype?
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.
What does it mean to be a carrier?
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.
What is genetic engineering?
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.
Is genetics vocabulary useful for English learners?
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.
Which genetics words should I learn first?
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.