Independent Inbreeding Paths

Sum caller-validated independent common-ancestor path contributions to offspring inbreeding.

Description

Pedigree path methods add common-ancestor contributions to inbreeding.

Pedigree path methods add common-ancestor contributions to inbreeding. Independent, nonduplicated paths are essential for a meaningful sum.

Sum caller-validated independent common-ancestor path contributions to offspring inbreeding.

When to use Independent Inbreeding Paths

Use this for the following task: Sum caller-validated independent common-ancestor path contributions to offspring inbreeding.

Prepare the observed records or explicit model parameters requested below. Keep probabilities as fractions and paired records aligned.

How to use Independent Inbreeding Paths and understand its results

Prepare the observed records or explicit model parameters requested below. Keep probabilities as fractions and paired records aligned.
Enter firstParentPathGenerations, secondParentPathGenerations, ancestorInbreeding, independentPathsConfirmed using the field table, then run the tool.
Read pathContributions, offspringInbreeding. Interpret flags, units, ordering and placeholder values using the rules below.
Review any reported issue or failed check, correct the supplied values when appropriate, and verify the result in its intended context.

Input field	Meaning	Value type and bounds	Requirement
firstParentPathGenerations	First parent path generations	list of number; each entry: number	Required
secondParentPathGenerations	Second parent path generations	list of number; each entry: number	Required
ancestorInbreeding	Ancestor inbreeding	list of number; each entry: number	Required
independentPathsConfirmed	Independent paths confirmed	boolean	Required

Align nonnegative integer path generations with ancestor coefficients in [0,1], and require independentPathsConfirmed true. Calculate each contribution and reject a total above one.^[1]

path = (1/2)^(n1+n2+1)(1+ancestorF); offspringF = Σpath

This summarizes the declared operation. Units, indexing, inclusivity and exceptional cases are explained in the surrounding text.

Output field	Meaning	Value type
pathContributions	Path contributions	list of number
offspringInbreeding	Offspring inbreeding	number

json

{
  "input": {
    "firstParentPathGenerations": [
      2,
      2
    ],
    "secondParentPathGenerations": [
      2,
      2
    ],
    "ancestorInbreeding": [
      0,
      0
    ],
    "independentPathsConfirmed": true
  },
  "output": {
    "pathContributions": [
      0.03125,
      0.03125
    ],
    "offspringInbreeding": 0.0625
  }
}

Limitations and assumptions

The tool does not discover ancestors or verify path independence; confirmation is a caller-supplied prerequisite.

The tool evaluates supplied observations or a declared model. It does not establish the biological cause of an observed pattern. Malformed requests produce input errors. A successfully evaluated request can still contain false flags, empty result lists or a result outside the supplied threshold; those outcomes have the meanings stated above.

Alternative or Complementary methods

Choose Inbreeding Accumulation for this operation: Project accumulated inbreeding using an explicit initial coefficient and constant effective size. For a complementary task, use Bottleneck Heterozygosity Loss for this operation: Project heterozygosity loss over a constant-size diploid bottleneck.

The implementation reference documents the exact calculation, supported input shapes and returned fields.

References

Independent Inbreeding Paths — tool.io

Similar or alternative tools

Inbreeding Accumulation
Project accumulated inbreeding using an explicit initial coefficient and constant effective size.
Bottleneck Heterozygosity Loss
Project heterozygosity loss over a constant-size diploid bottleneck.