Source: https://guthlabs.ai/docs/instruments/punnett-derived-carrier-risk-calculator-education/implementation/

instrument implementation / implementation-contract

# Punnett-derived Carrier Risk Calculator (education) implementation

A source-bound implementation contract for Punnett-derived Carrier Risk Calculator (education); deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-149

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification does not define behavior for invalid genotypes, does not uniquely define the unaffected category in recessive outputs, and permits dominant affected-status inputs that conceal an AA-versus-Aa distinction. These cases can produce rejection, undefined results, or materially different probabilities.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "inheritance_pattern": "autosomal_recessive",
    "parent1_genotype": "AA",
    "parent2_genotype": "aa"
  },
  "expected_outputs": {
    "affected_probability": 0,
    "carrier_probability": 1,
    "unaffected_probability": 0
  },
  "working": "Parent 1 can contribute only A: P(A)=1. Parent 2 can contribute only a: P(a)=1. Offspring genotype: Aa with probability 1×1=1. Therefore affected aa = 0, carrier Aa = 1, unaffected AA = 0."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/punnett-derived-carrier-risk-calculator-education/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/punnett-derived-carrier-risk-calculator-education/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/punnett-derived-carrier-risk-calculator-education/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`