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Learn Genetics

From pea plants to CRISPR: how traits are stored, copied and passed on.

Free to start. Built from a single prompt. No credit card.

Genetics explains how traits are encoded in DNA and passed from parents to offspring. It has two halves that fit together: classical genetics, which starts with Gregor Mendel's pea experiments and predicts inheritance with Punnett squares and pedigrees, and molecular genetics, which shows how DNA is copied, read into proteins and changed by mutation. Most of it is logical puzzle solving with simple probability. Learnr builds a personalized genetics course from a single prompt and teaches it with short lessons full of cross problems and pedigree practice.

How to learn Genetics, step by step

Get the core vocabulary exactly right. Separate gene from allele, genotype from phenotype, homozygous from heterozygous, and chromosome from chromatid. Most early mistakes in genetics problems come from blurring these pairs, so define each one in your own words.
Work Mendelian crosses by hand. Do monohybrid crosses until the 3:1 ratio feels obvious, then dihybrid crosses and the 9:3:3:1 ratio. For three or more genes, switch from giant Punnett squares to multiplying probabilities for each gene separately.
Connect inheritance to meiosis. Draw a pair of homologous chromosomes through meiosis I and II. Seeing independent assortment and crossing over explains why linked genes break the 9:3:3:1 ratio and how recombination frequencies are used to map genes.
Read pedigrees and the exceptions. Learn the signatures: autosomal dominant traits appear in every generation, and X-linked recessive traits mostly affect males through carrier mothers. Then study incomplete dominance, codominance in ABO blood types, epistasis and polygenic traits.
Learn the molecular machinery. Study the antiparallel double helix and A-T, G-C pairing, semiconservative replication, transcription, mRNA processing and translation with a codon chart. Then classify mutations as silent, missense, nonsense or frameshift and predict their effect on the protein.
Finish with populations and modern tools. Use Hardy-Weinberg (p squared + 2pq + q squared = 1) to estimate carrier frequencies, then learn what PCR, gel electrophoresis, sequencing and CRISPR-Cas9 do. Short daily Learnr problem sets keep your cross-solving fast throughout.

What you'll learn

Solve monohybrid and dihybrid crosses with Punnett squares and probability
Explain how meiosis, independent assortment and crossing over create variation
Read a pedigree and infer whether a trait is dominant, recessive or X-linked
Describe how DNA is replicated, transcribed and translated into protein
Explain what PCR, DNA sequencing and CRISPR are used for

What's inside your Genetics course

A sample path Learnr builds for Genetics. Your real course adapts to your goal and level.

1. Mendelian inheritance and Punnett squares
2. Chromosomes, meiosis and linkage
3. Pedigrees and non-Mendelian inheritance
4. DNA structure and replication
5. Gene expression and its regulation
6. Mutations, population genetics and biotechnology

How long does it take to learn Genetics?

Classical and molecular genetics basics take most learners about 2 to 3 months at 3 to 5 hours a week. A full university genetics course is a semester of steady work, and genomics or quantitative genetics need extra statistics and more time.

What you need before you start

Introductory biology, especially cells and cell division, and comfort with fractions and simple probability. Learnr reviews mitosis and meiosis when you need them.

Common mistakes to avoid

Assuming a dominant allele is more common or better. Dominance only describes which phenotype shows in a heterozygote, not frequency or fitness.
Filling in Punnett squares before working out the possible gametes, which leads to wrong ratios in dihybrid and sex-linked crosses.
Treating genes as destiny. Most traits, like height, are influenced by many genes plus environment, so single-gene thinking misleads you.

How Learnr builds your course

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Genetics questions, answered

Is there much math in genetics?

Mostly fractions and probability: multiplying independent chances, adding mutually exclusive ones, and simple algebra for Hardy-Weinberg. Population and quantitative genetics use more statistics.

What is the difference between genetics and genomics?

Genetics often studies individual genes and how they are inherited. Genomics studies entire genomes at once, using sequencing and computing to compare many genes across individuals or species.

Can I learn genetics without a biology background?

Yes, if you start with the basics of cells, DNA and cell division first. Learnr can add those foundations at the start of your course.