All about Punnett Square

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DESCRIPTION Each conceivable outcome for a genetic cross between two individuals with known genotypes is listed in the Punnett square diagram. Essentially, the Punnett square is mainly composed of a square divided into four quadrants for one trait (Monohybrid Cross) and sixteen quadrants for two (Dihybrid Cross).

Reginald Crundall PunnettPROPONENT The Punnett Square was proposed by Reginald Crundall Punnett, a British geneticist. As the creator of the Punnett square, Punnett is probably best remembered today. And to predict the probability of possible genotypes of offspring, biologists still use the Punnett square.

HOW TO USE PUNNETT SQUARE? 1. Determine the genotypes of the parents such as Aa x Aa.

HOW TO USE PUNNETT SQUARE? 2. Set up the Punnett square with one parent on each side. The upper part of the box is where the genotype of the male organism is placed while the genotype of the female organism is placed on the left side.

HOW TO USE PUNNETT SQUARE? 3. Fill out the Punnett square.

HOW TO USE PUNNETT SQUARE? 4. Analyze the number of offspring of each type.

• The Punnett Square was created in the early 1900s by Reginald Punnett.

• The Punnett square is a square diagram that is used to predict the genotypes of a particular cross or breeding experiment.

• The diagram is used by biologists to determine the probability of an offspring having a particular genotype.

• Punnett Square includes predicting crossing of plants, animals, even humans.

• A Punnett square can have more than 4 boxes. For two traits, an individual can produce 4 allele combinations and a two-trait Punnett Square has 16 boxes

Example 1

Example 2

Example 3