Autosomal Recessive Inheritance Risk Calculator

Autosomal Recessive Inheritance Risk Calculator | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Education
Input types: select, number
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The Autosomal Recessive Inheritance Risk Calculator estimates the affected-child risk for two parental genotype statuses and the cumulative chance that at least one of a specified number of children is affected. It supports carrier, affected, not-a-carrier, and unknown statuses, using a population carrier rate for unknown parents. Educational use only.

When to use

Estimate the per-child risk for an autosomal recessive condition from known parental statuses.
Use a population carrier rate when one parent's genotype status is unknown.
Calculate the cumulative probability that at least one of multiple children is affected.

How it works

1Select a status for each parent: carrier (Aa), affected (aa), not a carrier (AA), or unknown.
2Enter the population carrier rate when a parent's status is unknown, along with the number of children.
3The calculator combines each parent's probability of transmitting the recessive allele to determine the per-child affected risk.
4It reports the per-child result and the cumulative risk for at least one affected child using 1 − (1−r)^n; for two carriers, it also applies the 2/3 carrier probability among unaffected children.

Use cases

Teaching Mendelian inheritance with carrier, affected, and non-carrier genotype combinations.
Exploring how an unknown partner's population carrier rate changes recurrence risk.
Comparing single-child risk with the chance that at least one child is affected across several children.

Examples

1. Two carrier parents: 25% per child

Genetics student

Background

A student is reviewing autosomal recessive inheritance using two confirmed carriers, represented as Aa × Aa.

Problem

Calculate the affected, carrier, and non-carrier probabilities for each child and the risk across two children.

How to use

Select Carrier (Aa) for both parents, keep the population carrier rate at 0.04, enter 2 children, and choose 4 decimal places.

Parent 1: Carrier (Aa); Parent 2: Carrier (Aa); Population carrier rate: 0.04; Number of children: 2; Decimal places: 4.

Outcome

The per-child affected risk is 25%, the carrier probability is 50%, and the probability that at least one of two children is affected is 43.75%. An unaffected child has a 2/3 carrier probability.

2. Carrier and unknown partner: 1.08% per child

Genetics educator

Background

An educator wants to show how an unknown partner's population carrier rate changes the risk when the other parent is a confirmed carrier.

Problem

Estimate the affected-child risk when one parent is Aa and the unknown parent's population carrier rate is 4%.

FAQ

What parental statuses does the calculator support?

It supports carrier (Aa), affected (aa), not a carrier (AA), and unknown.

What does the population carrier rate mean?

It is the value c used to estimate an unknown parent's status, with P(Aa)=c and P(aa)=c².

What is the risk when both parents are carriers?

Each child has a 25% affected risk, a 50% carrier probability, and a 25% probability of being a non-carrier.

What is the 2/3 carrier rule?

For two carrier parents, an unaffected child has a 2/3 probability of being a carrier.

Is this calculator a substitute for genetic counseling?

No. It is intended for education and does not replace professional genetic counseling.

Parent 1: Carrier (Aa); Parent 2: Unknown; Population carrier rate: 0.04; Number of children: 1; Decimal places: 4.

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Two carrier parents: 25% per child

2. Carrier and unknown partner: 1.08% per child

FAQ

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