# Bonus: Shared ERVs Establish Human-Chimp Common Ancestry

URL: https://islamsproblems.com/shared-ervs-human-chimp-ancestry/
Part: Core Arguments

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### 10. Bonus: Shared ERVs Establish Human-Chimp Common Ancestry

Humans have a genome that is 3.2 billion base pairs. Retroviruses are viruses that insert DNA into your
genome at unpredictable locations. When this happens in egg and sperm cells, every descendant inherits
that DNA at the exact same spot. Most are nonfunctional.

Humans, chimps and monkeys share thousands of identical insertions at the exact same positions.
EACH of these happening without common ancestry is astronomically unlikely.

#### Nested pattern

- oldest are shared by all three

- newer ones are shared by only humans and chimps

- the newest aren't shared

The probability of all these shared insertions arising independently at these exact same positions in
this nested pattern is effectively zero without common ancestry.

[Evolution Explained By Salman Khan, Khan Academy](https://youtu.be/GcjgWov7mTM?si=hUo81MAvlxBQnoDs)

### Sources
- Evolution Explained By Salman Khan, Khan Academy: https://youtu.be/GcjgWov7mTM?si=hUo81MAvlxBQnoDs

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