Transgressive Offspring Screen

Identify offspring trait measurements outside the two-parent range.

Description

Transgressive offspring measurements lie outside the measured parental range.

Transgressive offspring measurements lie outside the measured parental range. The screen describes an observed trait pattern without identifying its genetic cause.

Identify offspring trait measurements outside the two-parent range.

When to use Transgressive Offspring Screen

Use this for the following task: Identify offspring trait measurements outside the two-parent range.

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

How to use Transgressive Offspring Screen and understand its results

Prepare the observed records or explicit model parameters requested below. Keep probabilities as fractions and paired records aligned.
Enter firstParentValue, secondParentValue, offspringValues using the field table, then run the tool.
Read belowParentIndexes, aboveParentIndexes, transgressivePercent. 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
firstParentValue	First parent value	number	Required
secondParentValue	Second parent value	number	Required
offspringValues	Offspring values	list of number; each entry: number	Required

Supply a nonempty offspring list in the same units as the two parents. Return zero-based indices of strictly outside values and their combined percentage.^[1]

below if offspring < min(parentValues); above if offspring > max(parentValues)

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

Output field	Meaning	Value type
belowParentIndexes	Below parent indexes	list of number
aboveParentIndexes	Above parent indexes	list of number
transgressivePercent	Transgressive percent	number

json

{
  "input": {
    "firstParentValue": 10,
    "secondParentValue": 20,
    "offspringValues": [
      5,
      15,
      25
    ]
  },
  "output": {
    "belowParentIndexes": [
      0
    ],
    "aboveParentIndexes": [
      2
    ],
    "transgressivePercent": 66.66666666666667
  }
}

Limitations and assumptions

Equality with a parent is not transgressive. Measurement uncertainty and trait architecture are not modeled.

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 Intermediate Heterozygote Screen for this operation: Screen a measured heterozygote trait for an intermediate midpoint pattern. For a complementary task, use Generation Genetic Gain for this operation: Compare absolute and compounded observed trait improvement per generation.

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

References

Transgressive Offspring Screen — tool.io

Similar or alternative tools

Intermediate Heterozygote Screen
Screen a measured heterozygote trait for an intermediate midpoint pattern.
Generation Genetic Gain
Compare absolute and compounded observed trait improvement per generation.