Heredity and DNA
Why do you have your mother’s eye color or your father’s height? The answer is heredity — the passing of traits from parents to offspring — and it all runs on a molecule called DNA. This lesson connects the words you keep hearing (DNA, gene, chromosome, trait) so they finally line up in the right order.
From DNA to Traits
Think of it as a set of nested instructions. DNA is the molecule that carries the instructions for building and running a living thing. A gene is a section of DNA that codes for one particular trait, like eye color. Genes are packed into chromosomes, the thread-like structures found in the nucleus of each cell. And a trait is the actual characteristic you can observe, like brown eyes.
The order from smallest instruction to visible result: DNA makes up genes, genes sit on chromosomes, and the genes you inherit produce your traits. Offspring get a mix of chromosomes from both parents, which is why you resemble both.
How Traits Pass to Offspring
You inherit chromosomes in pairs — one of each pair from each parent. Because you get instructions from both, you can end up with a blend of family traits, or a trait that skipped a generation. The specific rules for how these combinations work are the subject of genes, alleles, and Punnett squares, but the foundation is simple: traits are carried by genes, genes are made of DNA, and DNA passes from parents to children.
Why This Matters
Almost every genetics question builds on these four words in the right relationship. If you can say “DNA makes up genes, genes are on chromosomes, and genes determine traits,” you already have the framework. The test may show a diagram of a cell, a chromosome, or a family and ask you to place these terms correctly — and now you can.
Watch: A Short Video Lesson
Amoeba Sisters walks through this skill clearly in a few minutes. It is a helpful companion to the reading above:
A Routine for Heredity Questions
- Order the terms: DNA → gene → chromosome; genes determine traits.
- Remember DNA carries instructions; a gene codes for one trait.
- Chromosomes come in pairs, one from each parent.
- Traits are the observable results of inherited genes.
Practice
- What molecule carries the instructions for a living thing?
- What is a gene?
- Where in the cell are chromosomes found?
- What is a trait?
- How many chromosomes of each pair come from each parent?
- Put in order from smallest to largest: chromosome, gene, DNA.
Answers
- DNA.
- A section of DNA that codes for one trait.
- In the nucleus.
- An observable characteristic, like eye color.
- One from each parent.
- DNA, gene, chromosome.
Where This Fits in Your Science Prep
Heredity sets up the rules of inheritance in genes, alleles, and Punnett squares, and it connects to meiosis, which produces the cells that pass DNA on. See all topics on the Science Topics Hub.
Recommended Prep Books
These study guides and practice books help you keep building momentum as you prepare:
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