What Are Genetic Patterns?
Have you ever noticed that some traits seem to run in families? Maybe everyone on one side of the family has curly hair, or a particular eye colour keeps showing up generation after generation. These repeating traits are called genetic patterns, and scientists can study them to predict how characteristics are passed from parents to offspring.
A repeating trend in how a characteristic is inherited across generations of a family or population.
A specific characteristic of an organism, such as eye colour, blood type, or height, that can be passed from parent to offspring.
Genetics is the branch of biology that studies heredity — how living things pass their characteristics to the next generation. By identifying genetic patterns, scientists can:
- Understand why offspring look similar to (but not exactly like) their parents
- Predict the likelihood of a trait appearing in future generations
- Identify whether certain diseases or conditions might be inherited
Think of genetic patterns like a family recipe. The original dish gets passed down, but each cook might add a small twist — so the result is similar but never identical. Genes work the same way: the "recipe" is shared, but small variations create unique individuals.
MYP Connection — Key Concept: Relationships
In MYP Sciences, the Key Concept for this unit is Relationships. Genetics is all about the relationships between parents and offspring, between alleles and traits, and between DNA and the living world. As you work through this subtopic, keep asking: what is connected to what, and how does that relationship shape living things?
Key Vocabulary: Genes, Alleles, and Loci
Before we can identify and use genetic patterns, we need to understand the language of genetics.
A section of DNA that codes for a specific characteristic or protein. Each gene has a specific location on a chromosome.
One of two or more versions of a gene. For example, the gene for flower colour in pea plants has alleles for purple flowers and alleles for white flowers.
The specific position of a gene on a chromosome.
Humans have 23 pairs of chromosomes in most nucleated body cells (cells that contain a nucleus). Because chromosomes come in pairs, you have two alleles for every gene — one inherited from your biological mother, and one from your biological father.
These two alleles may be the same or different:
Having two identical alleles for a particular gene (e.g., BB or bb).
Having two different alleles for a particular gene (e.g., Bb).
Capital letters are used to represent dominant alleles, and lowercase letters represent recessive alleles. This is a universal convention in genetics notation.
Diagram showing a pair of homologous chromosomes with the locus of a gene marked, and two alleles (B and b) labelled on each chromosome to show the difference between homozygous and heterozygous.
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