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What is a Punnett square?

Updated: 4/27/2022
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6y ago

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A Punnett square is a four-square diagram for showing the probabilities of an offspring to inherit a certain pair of alleles from its parents.

For example,

___T_ t__

T | TT| Tt |

t | Tt | tt |

The Tt's (representing both parents' genotype) outside the Punnett square tell what the inner four squares will read. The inner squares tell what trait the parents' offspring might have.

The Punnett square above shows that the offspring has a 25% chance of inheriting the homozygous dominant trait, 50% chance for heterozygous trait, and 25% for recessive.
A Punnett Square takes two genotypes (discriptions of a gene) and determines the likelihood of four possible offspring carrying the genotypes. For example, blue eyes is a recessive gene. In order to have blue eyes, someone must have the genotype bb. The genotype BB or Bb would appear as brown eyes, the dominant trait. A Punnett Square of a blue-eyed organism and a brown-eyed organism (who carries the trait for blue eyes) would result in four potential offspring with the genotypes Bb, Bb, bb, and bb (two offspring have blue eyes and two have brown eyes but carry the blue-eyed trait). Punnett Squares allow scientists to predict POSSIBLE outcomes; they don't necessarily determine the offsprings' genotypes.

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14y ago

A Punnett square is a square that represents possible allele combinations for the result of a cross.

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Online Punnett Square Calculator?

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On the outside of the Punnett Square you put the genotype or two alleles of the parents.


What does the capital letter in a Punnett square represent?

In a Punnett square, a capital letter represents a dominant allele.


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