## Problem 037 — rank:267

**Title:** Stochastic X-chromosome inactivation

**Added binding assumptions (LaTeX):**

```latex
Define a finite commitment time and include unresolved, both-inactive and neither-inactive outcomes unless almost-sure commitment to exactly one inactive X is established. The exponential fraction formula describes deterministic clone masses with constant net rates, not the expectation of a ratio in a finite stochastic population. Specify conditioning on survival and escape-gene measurement independently of the choice variable.
```

**Direct edits:** 0. **Fresh external checks:** None; supplied sources retained as provenance.