The Basics of Genetics and DNA
Understand how DNA stores information, how traits pass between generations, and how to read genetic claims critically.
This course is for members
$9 unlocks every course in the library, this one included, plus a credit to build a topic of your own and at least 10 new courses every month.
What you will learn about The Basics of Genetics and DNA
The 7-day sprint
- DNA Is a Sequence, Not a Blueprint Picture. DNA stores information as a long ordered sequence of four chemical letters held in a double helix, and the pairing rules of those letters are what make it copyable.
- Genes, Chromosomes, and the Genome. A genome is the whole DNA sequence of an organism, chromosomes are the packages it comes in, and genes are functional stretches within it.
- From DNA to Protein. Cells read a gene by copying it into RNA and then translating that RNA three letters at a time into a chain of amino acids that folds into a working protein.
- How Traits Pass to the Next Generation. You carry two versions of most genes, meiosis shuffles and separates them into sperm or egg cells, and how those versions interact determines what shows up in the offspring.
- Mutation and Variation. Changes in DNA sequence arise constantly from copying errors and damage, most do nothing, and the ones that persist are the raw material of both disease and evolution.
- Regulation, Environment, and Complex Traits. Nearly every cell in your body holds the same genome, so what makes cells and people differ is which genes are switched on, how strongly, and under what conditions.
- Reading Genetics in the Real World. Sequencing, ancestry tests, carrier screening, and gene editing all rest on the same basics, and knowing those basics lets you judge what a genetic claim actually supports.
The 80/20: the 7 concepts that matter most
- Sequence Is the Information, Pairing Is the Copying
- Genes Make Proteins, Proteins Make Traits
- Two Copies, Shuffled Every Generation
- Mutation Is Constant, and Mostly Uneventful
- Regulation Decides Which Genes Are On
- Most Traits Are Polygenic and Environment-Sensitive
- Heritability Describes Populations, Not People
The core idea, explained like you are 5
DNA is a very long message written in a four-letter chemical alphabet, and living things work by copying that message and reading parts of it to build proteins.
Then the quiz and the ladder
10 questions that correct you when you are wrong, and beginner, intermediate, advanced levels, each with a practical exercise.