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A Punnett square showing a typical test cross. (green pod color is dominant over yellow for pea pods [1] in contrast to pea seeds, where yellow cotyledon color is dominant over green [2]). Punnett squares for each combination of parents' colour vision status giving probabilities of their offsprings' status, each cell having 25% probability in ...
A punnet is a small box or square basket for the gathering, transport and sale of fruit and vegetables, typically for small berries susceptible to bruising, spoiling and squashing that are therefore best kept in small rigid containers. Punnets serve also as a rough measure for a quantity of irregular sized fruits.
Test crosses are only useful if dominance is complete. Incomplete dominance is when the dominant allele and recessive allele come together to form a blend of the two phenotypes in the offspring. Test crosses are also not applicable with codominant genes, where both phenotypes of a heterozygote trait will be expressed.
Punnett squares for each combination of parents' colour vision status giving probabilities of their offsprings' status, each cell having 25% probability in theory. Normal text denotes a person (or chromosome from a person) who has normal colour vision and no defective gene, italics: has normal colour vision and a defective gene, and bold: is ...
Punnett is probably best remembered today as the creator of the Punnett square, a tool still used by biologists to predict the probability of possible genotypes of offspring. His Mendelism (1905) is sometimes said to have been the first textbook on genetics; it was probably the first popular science book to introduce genetics to the public.
Print/export Download as PDF; Printable version; In other projects ... Punnett square: Used to predict the genotypes of a particular cross or breeding experiment:
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