• 60 prompts
  • Checked October 2026

DNA Writing Prompts

A code in every cell, what I got from whom, twins, a detective's clue.

DNA Writing Prompts

Show all 60
  1. DNA was first found in the 1800s, long before anyone knew what it did. Write the lab notebook page for that day.Fact: DNA was first isolated in 1869, and nearly a century passed before its structure was worked out.
  2. People's DNA is almost entirely the same. Write a detective's toast to the tiny part that is not.Fact: 99.9% of human DNA sequences are the same in every person.
  3. Write about being someone's twin for one day. Whose, and what would you compare first?Angle: hands, handwriting, what makes you both laugh.

Next step Get a twin story ideaWrite a cell story

All 60 prompts

A code in every cell 15

  • A cell is about to divide and must copy its whole instruction book first. Write the copying room on a busy day. Fact: when a cell prepares to divide, the DNA helix splits down the middle and each strand is a template.
  • DNA is written in four letters: A, T, G and C. Write a secret message that uses only those four, and the key that unlocks it. Fact: the four bases in DNA are adenine (A), thymine (T), guanine (G) and cytosine (C).
  • DNA looks like a twisted ladder. Write a climb up it, rung by rung, by someone very small. Fact: the double helix looks much like a twisted ladder, and each rung is a pair of bases.
  • DNA was first found in the 1800s, long before anyone knew what it did. Write the lab notebook page for that day. Fact: DNA was first isolated in 1869, and nearly a century passed before its structure was worked out.
  • For years most scientists thought DNA was too simple to matter. Write the diary of someone who suspected it was not. Fact: most scientists once thought DNA too simple a molecule to carry life's instructions.
  • Half of a coded message is torn away, but the half that is left is enough. Write how the reader rebuilds it. Fact: knowing the bases on one strand of DNA, it is simple to work out the bases on the other.
  • The human instruction book is about three billion letters long. Write the librarian's note on the shelf where it is kept. Fact: the human genome holds about 3 billion bases and about 20,000 genes.
  • In 1953 scientists worked out the shape of DNA partly by building models. Write the afternoon the model finally stands up. Fact: the double helix was worked out in 1953 from X-ray patterns and model building.
  • In DNA, A always pairs with T, and C with G. Write a dance class where the partners can never change. Fact: base A always pairs with base T, and C with G.
  • The same kind of code runs a mushroom, an oak and a whale. Write a meeting where the three compare their instructions. Fact: DNA carries the genetic instructions of all known organisms.
  • Someone stores a favorite poem in DNA instead of on a computer. Write the label on the tube. Fact: DNA has enormous potential for storing information, far more densely than electronic devices.
  • Write a cell's instruction book as a real book: the title, the table of contents, and the pages that are not recipes. Fact: genes make up only about 1 percent of the DNA sequence.
  • Write a story in which one changed letter changes the ending. Fact: the order of the bases decides what instruction a stretch of DNA holds.
  • Write an apology from a copying machine that has made one small mistake in a very long book. Angle: it copied the rest correctly. Does it mention that?
  • Write instructions so exact that a stranger could follow them with no pictures. Then say what DNA must do that yours do not. Fact: DNA contains the instructions an organism needs to develop, survive and reproduce.

What I got from whom 15

  • A gardener saves seeds from the sweetest tomato every year. Write the garden ten summers later. Angle: what did she get more of, and what did she lose without noticing?
  • A kitten has one orange parent and one gray parent. Write the guesses of everyone waiting to see the litter. Angle: nobody guesses right, including the vet.
  • A puppy in a litter looks like neither parent. Write the conversation between the two dogs' owners. Fact: genes are passed from parents to offspring and hold the information for physical traits.
  • Eye color is inherited; a scar is not. Write a scene in which a child asks which of an old sailor's features his grandchildren got. Fact: eye color is an example of an inherited characteristic.
  • Height is a trait you can measure; eye color is one you can only name. Write a character sheet that uses both kinds. Fact: traits can be qualitative, such as eye color, or quantitative, such as height.
  • Invent a family and give each member one feature: a chin, a laugh, a way of walking. Write who got what from whom. Angle: a made-up family is fine. So is a family of cats.
  • Some traits come from genes, some from the life you lead, and many from both. Write a character and sort three of her traits. Fact: a trait can be determined by genes, by environmental factors or by a combination of both.
  • Two seeds from the same pod are planted in two very different gardens. Write the day the gardeners compare them. Fact: traits arise from an organism's genes interacting with its environment.
  • Two siblings argue over who looks more like which side of the family. Write the argument and the photo album that settles nothing. Angle: every relative who weighs in has a different answer.
  • What would you want written in the instructions for a pet dragon? Write five inherited traits and one it has to learn. Angle: fire-breathing may run in the family. Good manners do not.
  • Write a family recipe that has been changed a little by each person who copied it down. Angle: a recipe is handed on with small changes. Who changed what, and was it a mistake?
  • Write a story about packing a whole set of instructions into 23 pairs of suitcases. Fact: the human genome sits on 23 pairs of chromosomes.
  • Write a thank-you note to an ancestor you never met, for one thing you imagine they passed down. Angle: real or invented. A nose, a singing voice, a way with animals.
  • Write about a trait you share with someone who is not related to you at all. Angle: a habit, a taste, a way of talking. Where did each of you get it?
  • Write about something you are good at that nobody handed down to you. How did you get it? Angle: practice, a teacher, a stubborn streak, a lucky afternoon.

Twins 15

  • A new teacher mixes up identical twins all week. Write the trick each twin uses to be known. Angle: it is never the face. It is a word, a pencil grip, a way of waiting.
  • A test could tell two fraternal twins apart, but not two identical ones. Write the scene where a lab worker explains why. Fact: DNA can tell one person from another, unless they are identical twins.
  • A twin describes what is hers alone. Write the list. Angle: a scar, a favorite song, a fear, a friend, a memory the other slept through.
  • Fraternal twins are as alike as any brother and sister. Write about twins who are tired of being asked if they are identical. Fact: fraternal twins share half their genomes, just like any other siblings, and may not look alike.
  • Identical twins have different fingerprints. Write the small mystery this solves. Fact: identical twins do not have the same fingerprints.
  • Identical twins start from one egg that splits in two. Write the morning two twins decide they want to be told apart. Fact: identical twins come from a single fertilized egg that splits into two, so they share the same genome.
  • Scientists who study twins ask how much of a trait comes from genes. Write the questionnaire, with one question the twins refuse to answer. Fact: by comparing identical and fraternal twins, researchers estimate how much genetics is involved in a condition.
  • Some twins are mirror images of each other. Write a morning at their bathroom mirror. Fact: mirror image twins, facing each other, appear as matching reflections.
  • Twin calves are born on a farm, and the farmer cannot tell them apart. Write the week she learns to. Angle: a swirl of hair, a bolder walk, who reaches the gate first.
  • The twins in your story are a boy and a girl. Write the moment a stranger insists they must be identical. Fact: identical twins are nearly always the same sex; fraternal twins may or may not be.
  • Two identical twins grow up in different towns and meet as adults. Write what matches and what does not. Angle: same genome, different weather, food, friends and luck.
  • Write a letter from one twin to the other on the first day they are in different classrooms. First line: Nobody here calls me by your name, and I keep waiting for it.
  • Write a poem in two columns, one for each twin, where some lines match and some do not. Angle: let the matching lines be the short ones.
  • Write about being someone's twin for one day. Whose, and what would you compare first? Angle: hands, handwriting, what makes you both laugh.
  • Write one day twice: once by each of two identical twins who were in the same places and noticed different things. Angle: the same instructions, two people. What does each one see first?

A detective's clue 15

  • A detective has two suspects who are identical twins. Write her worst day at work. Fact: a DNA profile tells people apart unless they are identical twins.
  • A detective is handed one clue: the letters A, T, G and C in a long row. Write what she does with it. Angle: she cannot read it. Who can, and what do they need to read it against?
  • A dog is found with no collar. Write how a clue smaller than a hair gets it home. Angle: what is on the dog, and who has something to compare it with?
  • A fish at the market is labeled as one kind and looks like another. Write the food inspector's day. Fact: DNA analysis meant to identify a species, rather than an individual, is called DNA barcoding.
  • A museum has an old hairbrush said to have belonged to a queen. Write the test, and the answer nobody expected. Fact: DNA can be recovered from samples such as bone, teeth and hair.
  • A slice of cake is gone and a fork is left behind. Write the case as a detective who is far too excited about the fork. Fact: DNA fingerprinting matches a sample from a known person with one from an unknown person.
  • DNA matching was worked out in 1984. Write a detective in 1983 who wishes for a kind of clue she cannot name yet. Fact: DNA profiling was discovered in 1984 at a university in England.
  • People's DNA is almost entirely the same. Write a detective's toast to the tiny part that is not. Fact: 99.9% of human DNA sequences are the same in every person.
  • Scientists have read DNA from a woolly mammoth. Write a detective story in which the witness has been frozen for a very long time. Fact: ancient DNA has been recovered from extinct animals such as the woolly mammoth.
  • Someone is cleared by a DNA test after everyone was sure. Write the apology they are owed. Fact: DNA matching has been used as a tool to exonerate the falsely accused.
  • Two apple trees in an old orchard might be the same kind. Write how a grower finds out without waiting for fruit. Angle: a leaf goes to a lab. What comes back, and is the grower pleased?
  • Write a detective's speech to a room of suspects on why a DNA match narrows the list but does not close the case. Fact: DNA fingerprinting cannot say exactly who did something; it helps narrow down a list of suspects.
  • Write a mystery in which the DNA clue points to the wrong person, and say how the detective finds out. Angle: a borrowed coat, a shared cup, a handshake.
  • Write the case of the chewed garden hose, solved by a scientist who studies animals and has never met a detective. Fact: DNA profiling is also used to study animal and plant populations.
  • Write the lab report for the case of the missing sandwich, in the driest official language you can manage. First line: Sample A was recovered from a lunch box at 12:40 and is described as crumbs.

How it works

A DNA writing prompt works best small: four letters, one changed letter, one family nose. These go from the code in a cell to traits handed down, to twins, and to a detective with a fork and a missing slice of cake.

Read the full guide

A code of four letters

The first group treats DNA as writing. Send a secret message in A, T, G and C, rebuild a torn message from the half that is left, or run a dance class where the partners never change. Most of its fact lines are from the National Human Genome Research Institute's DNA fact sheet.

What I got from whom

These fifteen are about inherited traits, and any family will do: an invented one, a litter of kittens, a pet dragon. One asks about something you are good at that nobody handed down to you.

  • Keep the detective cases small. A missing sandwich leaves room to be funny about the lab report.
  • For twins, write what differs. The sameness is the part every reader already expects.

Questions and answers

What is a good DNA writing prompt?

Half of a coded message is torn away, but the half that is left is enough: write how the reader rebuilds it. Or write one day twice, once by each of two identical twins who noticed different things.

What are the four letters of DNA?

A, T, G and C: the bases adenine, thymine, guanine and cytosine. A always pairs with T, and C with G, and the order of the letters is the instruction, the National Human Genome Research Institute explains.

Do identical twins have the same DNA?

They share the same genome, because they come from one fertilized egg that splits in two. Their fingerprints still differ. Fraternal twins share half their genomes, like any other brothers and sisters.

Do I have to write about my own family?

No. Every prompt on inherited traits works with a made-up family, an animal's or a plant's, and one is about a trait you share with someone who is not related to you.

More tools

Show 6 more

Browse Writing Prompts