Plant Biology & Cloning

The Bodhi Tree That Never Dies

A sacred fig tree, a branch carried across the sea, and the science of making life identical.

Plant Biology & Cloning12-Month Curriculum 10h

The Story

The Tree of Awakening

In the year 528 BCE, in a town called Bodh Gaya in northern India, a man named Siddhartha Gautama sat down beneath a large fig tree. He had been wandering for six years, searching for an end to suffering. He had tried fasting until his ribs showed. He had tried meditation until his mind went silent. Nothing had worked.

That night, under the spreading branches of a Ficus religiosa — a sacred fig — he sat in stillness and vowed not to rise until he understood the nature of existence. By dawn, he had attained enlightenment. He became the Buddha, the Awakened One. And the tree became the Bodhi Tree — the tree of awakening.

For centuries, the Bodhi Tree stood in Bodh Gaya. Pilgrims came from across Asia to meditate beneath its branches. It was not just a symbol — it was a living connection to that dawn of understanding.

But trees do not live forever. Storms come. Droughts come. Wars come. And the people who loved the Bodhi Tree knew they could not trust fate to preserve it.

The Branch That Crossed the Sea

In the 3rd century BCE, about 250 years after the Buddha's enlightenment, Emperor Ashoka of India sent his daughter Sanghamitta on a mission to Sri Lanka. She was a Buddhist nun, and she carried with her something more precious than gold: a cutting from the Bodhi Tree.

Not a seed. A cutting — a living branch, carefully wrapped and kept moist during the long sea journey from India to the island of Sri Lanka.

Why a cutting instead of a seed? Because a seed is a gamble. A seed carries genes from two parents, mixed and recombined. The tree that grows from a seed is a new individual — similar to its parents but not identical. It might be taller, shorter, more or less resistant to drought. It is its own self.

A cutting is different. A cutting is a piece of the original tree. When you plant it and it grows roots and new leaves, every cell in the new tree carries exactly the same DNA as the parent. The new tree is not the child of the Bodhi Tree. It is the Bodhi Tree — the same genetic individual, growing in a new place.

Sanghamitta knew this, in the way that ancient farmers knew it long before the word DNA existed. When you want the exact same mango — the same sweetness, the same size — you do not plant a seed. You take a branch and graft it. You take a cutting and root it. You clone it.

The Sri Maha Bodhi

The cutting was planted in the ancient capital of Anuradhapura in Sri Lanka. It took root and grew into a magnificent tree. Today, over 2,300 years later, it is known as the Sri Maha Bodhi, and it is considered the oldest living tree planted by a human being with a known planting date.

Generations of monks have tended it. When branches fell in storms, they planted those fallen branches — more cuttings, more clones. When the original Bodhi Tree in Bodh Gaya was destroyed (it was cut down at least three times over the centuries — by enemies of Buddhism, by storms, by neglect), cuttings from the Sri Lanka tree were sent back to India to replace it.

Think about that. The tree in Bodh Gaya today is a clone of a clone. It grew from a cutting taken from the Sri Lanka tree, which grew from a cutting taken from the original tree beneath which the Buddha sat. The DNA is the same. The genes that shaped the leaves, the bark, the roots, the pattern of branching — all identical to the tree of 528 BCE.

The Science in the Story

Every banana you eat is a clone. Every Granny Smith apple is a clone. Every navel orange, every Alphonso mango, every wine grape — clones, propagated by cuttings and grafts for decades or centuries. The Cavendish banana that fills supermarket shelves worldwide is a single genetic individual, reproduced billions of times without a seed ever being planted.

The Bodhi Tree lineage is one of the oldest documented examples of this practice. The monks of Anuradhapura were doing biotechnology 2,300 years before the word was invented.

And the science behind it raises profound questions: What does it mean for two trees, separated by an ocean and twenty-three centuries, to carry the same DNA? Is the tree in Sri Lanka the "same" tree as the one in Bodh Gaya? If you clone a tree, have you preserved it or merely copied it?

These are not just botanical questions. They are the questions of our age — the age of CRISPR, gene editing, and the possibility of cloning animals and even rewriting the code of life itself.

The Bodhi Tree offers no easy answers. But it has been asking the right questions for 2,500 years.

The end.

Before you start

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Python Basics

Prerequisite coding course

Try It Yourself

Choose your level. Everyone starts with the story — the code gets deeper as you go.

Level 0: Listener

No coding needed — learn the science through the story

What You'll Discover

The real-world science of plant reproduction, DNA, cloning, grafting, tissue culture, and gene editing — from ancient cuttings to CRISPR.

The big idea: "The Bodhi Tree That Never Dies" teaches us about Plant Biology & Cloning — and you don't need to write a single line of code to understand it.

Seeds vs Cuttings — Two Ways to Make a New Plant

Pick up a mango. Inside, there is a large seed. Plant that seed, water it, and in a few weeks a shoot appears. A new mango tree is born. But here is the thing most people do not realise: that new tree will almost certainly produce mangoes that taste different from the mango you ate. Maybe sweeter. Maybe more sour. Maybe smaller. You will not know until it fruits, years from now.

Why? Because the seed was made through sexual reproduction. The mango flower had to be pollinated — pollen from one parent combined with an egg cell from another. Each parent contributed half its DNA, and the two halves shuffled together like two decks of cards being mixed. The result is a unique combination that has never existed before. This is why siblings look similar but not identical — same parents, different card shuffle.

Now try something different. Cut a healthy branch from your favourite mango tree. Dip the cut end in rooting powder (which contains a hormone called auxin). Plant it in moist soil. In a few weeks, roots sprout from the cut end. A new tree grows — and when it fruits, the mangoes taste exactly the same as the parent tree. Same sweetness, same size, same everything.

This works because the cutting is not a new individual. It is a piece of the original tree. Every cell in that branch contains exactly the same DNA as every other cell in the parent tree. No pollination happened. No gene shuffling. No second parent. The new tree is a clone — a genetically identical copy.

Check yourself: If you plant 10 seeds from the same Alphonso mango, will all 10 trees produce identical fruit? Why or why not?

Key idea: Seeds mix DNA from two parents, creating unique offspring (sexual reproduction). Cuttings carry DNA from one parent only, creating an exact genetic copy — a clone (asexual reproduction). This is why farmers clone their best fruit trees instead of planting seeds.

What Does "Genetically Identical" Mean?

Every living cell contains a molecule called DNA — deoxyribonucleic acid. DNA is a long, twisted ladder (the famous double helix) made of four chemical "letters": A, T, G, and C. The human genome is about 3.2 billion letters long. The fig tree genome is about 530 million letters.

Specific sections of the DNA ladder are called genes. A gene is an instruction — "make this protein" or "grow leaves this shape" or "produce this pigment." The Bodhi Tree's DNA contains genes for heart-shaped leaves, smooth grey bark, and the ability to produce tiny figs that feed birds.

When a cell divides to grow or repair itself, it copies its entire DNA. The copying process — called DNA replication — is astonishingly accurate. The cell's molecular machinery reads each letter and builds an exact duplicate. Errors happen only about once every billion letters copied.

When you take a cutting from a tree, every cell in that cutting already has a complete copy of the parent's DNA. When the cutting grows new roots and new leaves, those new cells are produced by dividing the existing cells — copying the same DNA over and over. No new DNA is introduced. No mixing. No shuffling. The result: every cell in the new tree has the same DNA as the parent. That is what "genetically identical" means.

Think about it: The Sri Maha Bodhi tree in Sri Lanka has been growing for 2,300 years. Its cells have divided trillions of times. Each division copied the DNA. Despite 2,300 years of copying, the DNA is still essentially the same as the original Bodhi Tree. That is how reliable DNA replication is.

Key idea: DNA is the instruction manual in every cell, written in a 4-letter code (A, T, G, C). Genes are specific instructions within DNA. Clones are genetically identical because the cutting's cells divide by copying the same DNA — no new genetic information enters.

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Grafting and Tissue Culture — Cloning in the Lab and the Orchard

**Grafting** is one of the oldest cloning techniques, used for at least 4,000 years. The principle is simple: take a branch from the tree you want to ...

The Ethics of Cloning — From Dolly to CRISPR

Cloning plants is easy because plant cells are **totipotent** — any cell can become a whole new organism. Cut a branch, and it can grow roots. Take a ...

Story Progress

Ready to Start Coding?

Here is a taste of what Level 1 looks like for this lesson:

Level 1: Explorer — Python

# Clone vs Seed Simulator
import random

# Parent tree DNA (simplified: 10 genes)
parent_dna = ['A1', 'B2', 'C1', 'D2', 'E1', 'F2', 'G1', 'H2', 'I1', 'J2']

# Clone: exact copy
clone_dna = parent_dna.copy()

# Seed: mix of two parents
parent_b = ['A2', 'B1', 'C2', 'D1', 'E2', 'F1', 'G2', 'H1', 'I2', 'J1']
seed_dna = [random.choice([parent_dna[i], parent_b[i]]) for i in range(10)]

print("Parent DNA:", parent_dna)
print("Clone DNA: ", clone_dna)
print("Seed DNA:  ", seed_dna)
print()
print(f"Clone matches parent: {sum(c == p for c, p in zip(clone_dna, parent_dna))}/10 genes")
print(f"Seed matches parent:  {sum(s == p for s, p in zip(seed_dna, parent_dna))}/10 genes")
# Run this multiple times -- the clone always matches 10/10.
# The seed varies every time. That's the difference.

This is just the first of 6 coding exercises in Level 1. By Level 4, you will build: Build a Plant Growth Simulator.

By Level 4, enrolled students build: Build a Plant Growth Simulator

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What You'll Discover

The real-world science of plant reproduction, DNA, cloning, grafting, tissue culture, and gene editing — from ancient cuttings to CRISPR.

The big idea: "The Bodhi Tree That Never Dies" teaches us about Plant Biology & Cloning — and you don't need to write a single line of code to understand it.

Seeds vs Cuttings — Two Ways to Make a New Plant

Check yourself: If you plant 10 seeds from the same Alphonso mango, will all 10 trees produce identical fruit? Why or why not?

What Does "Genetically Identical" Mean?

Sign up free to keep learning

Access all 130+ lessons, quizzes, interactive tools, and offline activities

or sign up with email

Grafting and Tissue Culture — Cloning in the Lab and the Orchard

**Grafting** is one of the oldest cloning techniques, used for at least 4,000 years. The principle is simple: take a branch from the tree you want to ...

The Ethics of Cloning — From Dolly to CRISPR

Cloning plants is easy because plant cells are **totipotent** — any cell can become a whole new organism. Cut a branch, and it can grow roots. Take a ...