# Fisher's Fundamental Theorem of Natural Selection

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**Formula:**`Fitness increase = h × s`

## Introduction to Fisher's Fundamental Theorem of Natural Selection

Fisher's Fundamental Theorem of Natural Selection is a mathematical theorem that describes the rate of increase in fitness resulting from natural selection. The formula is represented as ** Fitness increase = heritability (h) × selection coefficient (s)**. In this formula,

**represents the heritability of a trait, which is a measure of how much of the variation in the trait is genetic, and**

*h***represents the selection coefficient, which measures the relative reduction in the fitness of a genotype. The result represents the rate of increase in fitness due to natural selection.**

*s*## Parameter usage:

`h`

= heritability of a trait (0 to 1)`s`

= selection coefficient (greater than 0)

## Output:

`Fitness increase`

= rate of increase in fitness due to natural selection

## Data validation

The heritability should be between 0 and 1, and the selection coefficient should be greater than 0.

## Summary

This theorem provides an important theoretical framework for understanding the role of genetics and natural selection in driving evolutionary change.

Tags: Biology, Natural Selection, Heritability, Fitness, Evolution