Genetics & DNA

Watch

• How CRISPR lets you edit DNA - Andrea M. Henle ↗TED-Ed
• What is DNA and How Does it Work? ↗Stated Clearly
• Ancient DNA reveals the truth about Vikings - BBC REEL ↗BBC Global
• Epigenetics: Can we change our genes? - BBC World Service ↗BBC World Service
• Genetics 101 | National Geographic ↗National Geographic
• The Gene: An Intimate History - Episode 1 (2020) | Full Documentary ↗PBS America

Read

• The Double Helix: A Personal Account of the Discovery of the Structure of DNA ↗A candid, often controversial, first-person account of the race to uncover DNA's structure, offering a rare glimpse into the human drama of scientific discovery.James D. Watson
• The Selfish Gene ↗This seminal work reframes evolution from the gene's perspective, profoundly influencing how we understand heredity and altruism.Richard Dawkins
• Genome: The Autobiography of a Species in 23 Chapters ↗A remarkably accessible journey through each human chromosome, explaining the science of genetics with clarity and wit for the general reader.Matt Ridley
• The Gene: An Intimate History ↗A sweeping narrative history of genetics, from Mendel to CRISPR, exploring the profound ethical and philosophical implications of our understanding of heredity.Siddhartha Mukherjee
• Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid ↗The concise, groundbreaking paper that unveiled the double helix, fundamentally reshaping biology and laying the foundation for modern genetics.J.D. Watson and F.H.C. Crick

Voices to follow

• Jennifer Doudna ↗As co-discoverer of CRISPR-Cas9 gene editing, her insights are indispensable for grasping the revolutionary potential and profound ethical implications of altering the human genome.Biochemist, Nobel laureate, University of California, Berkeley
• Francis Collins ↗A pivotal figure in the Human Genome Project, he offers a unique vantage point on the scientific progress and societal responsibilities inherent in genetic research.Geneticist, former Director of the National Institutes of Health
• Siddhartha Mukherjee ↗His Pulitzer-winning narratives expertly demystify complex genetic science, making the history and future of the gene accessible and compelling for a global readership.Oncologist, author, Columbia University
• Carl Zimmer ↗His consistently lucid and engaging writing translates the cutting edge of genetic discoveries into understandable and thought-provoking prose for the public.Science journalist, The New York Times

Glossary

• AlleleAn allele is a different version or form of a specific gene. Just like there can be different versions of a recipe (e.g., chocolate chip cookies vs. oatmeal cookies), there are different alleles for a gene. For example, for the gene that determines eye color, there might be an allele for blue eyes and an allele for brown eyes.
• ChromosomeChromosomes are organized packages of DNA found inside the nucleus of your cells. They are like tightly wound spools that keep your long DNA strands neat and tidy. For example, humans usually have 23 pairs of chromosomes, with one set from your mother and one set from your father, each carrying thousands of genes.
• DNADNA (Deoxyribonucleic Acid) is like a detailed instruction manual found in almost every cell of your body. It contains all the information that tells your body how to grow, develop, and function. For example, your DNA has the instructions for your eye color, hair type, and even how tall you might become.
• DominantA dominant allele is a version of a gene that will always show its trait if it's present, even if you only have one copy of it. It "dominates" over other versions. For example, if you inherit one allele for brown eyes (dominant) and one for blue eyes (recessive), you will have brown eyes because the brown eye allele is dominant.
• GeneA gene is a small section of your DNA that carries specific instructions for a particular trait. Think of it as one recipe in the big instruction manual. For example, one gene might carry the recipe for making the protein that gives you brown eyes, while another gene might be for producing insulin.
• GeneticsGenetics is the scientific study of how traits are passed down from parents to their children, and how living things vary. It explores DNA, genes, and heredity to understand why we are all unique. For example, studying genetics helps scientists understand inherited diseases and how to develop new treatments.
• GenotypeYour genotype is the specific set of genes and alleles you have inherited from your parents. It's your unique genetic code, the "recipe" you carry inside your cells. For example, if we use 'B' for brown eyes and 'b' for blue eyes, your genotype might be 'BB' (two brown alleles) or 'Bb' (one brown, one blue).
• HeredityHeredity is the process by which traits and characteristics are passed down from parents to their children. It's why you might look similar to your parents or grandparents. For example, if both your parents have curly hair, you might inherit the trait for curly hair through heredity.
• MutationA mutation is a random change or mistake in the DNA sequence of a gene. These changes can happen naturally or be caused by outside factors. For example, a mutation might cause a gene to produce a slightly different protein, which could lead to a new trait or sometimes a genetic condition.
• PhenotypeYour phenotype is all the observable characteristics or traits that you actually show, which are a result of your genotype and sometimes your environment. It's what you can see. For example, if your genotype is 'Bb' (one brown eye allele, one blue eye allele), your phenotype would be brown eyes because brown is dominant.
• RecessiveA recessive allele is a version of a gene whose trait will only show up if you have two copies of it (one from each parent). If a dominant allele is also present, the recessive trait will be hidden. For example, for you to have blue eyes, you must inherit two recessive alleles for blue eyes, one from each parent.
• TraitA trait is any specific characteristic or feature of an organism that can be inherited. These are the things you can observe or measure about yourself. For example, your eye color, whether you can roll your tongue, or if you have attached earlobes are all examples of traits.

Threads 11

Where this connects to other fields, and why it's worth knowing.

• Developmental Psychology Psychology

  Really bad stress in early childhood can leave chemical 'sticky notes' on your genes, tags that don't change the DNA itself but change which genes get switched on. Years later those notes can raise the odds of heart disease or depression. It's trauma from age five, quietly written under the skin and read out decades on.

• Semiotics & Visual Culture Arts & Design

  In DNA, a three-letter code stands for a specific building block of protein, but which letters mean what is pure convention, not chemistry, they could have meant something else. That's exactly how words work: the sound 'dog' doesn't have to mean dog. DNA is a symbol system, a language frozen in place by evolution.

• Socialisation & the Self Sociology

  How you were raised, neglect or warmth, doesn't just shape your behavior; it can flip chemical switches sitting on your genes, turning some up or down. That means your childhood gets physically written onto your DNA. Startlingly, some of those marks can even be passed down to your own kids.

• Kinship & Family Sociology

  There's actual math behind why we look out for blood relatives: help a relative when how closely you're related, times how much it helps them, beats what it costs you (Hamilton's rule). Since you share half your genes with a sibling and an eighth with a cousin, 'you'd risk your life for two siblings or eight cousins' comes out of the arithmetic. Family love has a hidden formula written in genes.

• Migration & Diaspora Sociology

  When a small group of people breaks off, settles somewhere isolated, and multiplies, whatever rare genes those few founders happened to carry become weirdly common in their descendants. That's the founder effect. It's why certain inherited diseases cluster in groups like Ashkenazi Jews, Afrikaners, and island peoples, not bad luck or a curse, just the math of starting a population from a handful of people.

• Nutrition Health

  During a brutal 1944 famine in the Netherlands, pregnant women went hungry. Decades later, their now-elderly children still carried chemical 'switches' on their genes flipped by that starvation. A mother's diet didn't change the DNA letters, but it quietly changed how those genes behaved for an entire lifetime.

• Data Privacy Law Law

  You can protect your own DNA, but you can't speak for your relatives. Police caught the Golden State Killer because a distant cousin uploaded their DNA to a genealogy site. Your genes are partly shared with everyone you're related to, so their choice exposes you.

• Education and Social Mobility Sociology

  Here's a twist that bugs everyone: the fairer and more equal a society is, the more your genes seem to shape how far you get. When everyone has good schools and enough food, those big outside obstacles stop being the deciding factor, so natural differences show up more. Level the playing field, and biology's role gets louder, not quieter.

• Ancient Civilizations History

  Some people can drink milk as adults and others can't, that's written in your genes. And that gene only spread after humans started farming and keeping cattle. So building the first civilizations actually rewrote human DNA.

• Endangered and Dying Languages Literature

  Long before DNA, language detectives built family trees of languages by tracking how sounds slowly changed, like how Latin split into Spanish and French. A century later, biologists used the exact same branching trick to trace ancestry from tiny changes in DNA. Same logic, two totally different codes.

• The Periodic Table & the Elements Science

  Life's information is written in the chemistry of a few light elements — carbon, nitrogen, phosphorus — whose bonding the table explains.

  Sources: IUPAC — Periodic Table of Elements ↗