Punnett square


Also found in: Encyclopedia, Wikipedia.

Punnett square

 [pun´et]
a graphic depiction in grid form of how genes from each parent might combine in an offspring.
Punnett square showing sex chromosome combinations for male and female gametes. From Mueller and Young, 2001.
Punnett squareclick for a larger image
Fig. 262 Punnett square.

Punnett square

a table devised by the British geneticist R. Punnett, in which all possible combinations of gametes and progeny are displayed in a grid structure. For example in the cross:

Aa, Bb x aa, Bb

the Punnett square would be as in Fig. 262.

Punnett,

Reginald Crundall, English geneticist, 1875-1967.
Punnett square - a grid used in genetics. Synonym(s): checkerboard
References in periodicals archive ?
In this way, simple illustrations incorporate a considerable amount of information that provides the opportunity to determine genotype and phenotype probabilities for monogenic Mendelian traits without the need to draw Punnett square for every parental genotype combination.
If you look at the Punnett Square on page 14, you'll note the genotype in the lower right box should be "bbee," not "Bbee," as shown.
Following the same procedure as the monohybrid test, students build the Punnett square using the mathematical concept in Table 4.
A Punnett square visually demonstrates how alleles for a given trait from two parents segregate.
Question: What percent of the kittens in the Punnett square below will exhibit polydactyly, a dominant trait?
But the Punnett Square illustrates the odds of any color emerging.
Most of their kittens will be Munchkins." Use a Punnett square to tell what percent of the kittens will be Munchkins.
The students were instructed to find the genotypes of the parents and child, using a Punnett square to demonstrate how their answers were determined.
A chart called a Punnett square helps determine the types of traits an offspring can inherit.
There are a few minor details that could have clarified certain ideas for laymen, such as a traditional Punnett square to help illustrate crosses more clearly, simplified definitions (a phenotype is defined here as "a manifestation of a genotype," which isn't a very clear definition for the layman), and a better explanation of dominance/recessiveness, for example.
To help determine the odds that an offspring will have a certain trait, you can use a Punnett square:
I first ask: "Based on a Punnett Square, what are the odds that a carrier of a new mutation will leave carrier descendants?