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The Punnett square is a square diagram that is used to predict the genotypes of a particular ... "3" of the offspring have "Brown" eyes and only one offspring has ...
An animal that has at least one copy of the B allele will have a black nose, paw pads and eye rims and (usually) dark brown eyes. b = Brown eumelanin - such as chocolate or liver (includes several alleles - b s, b d and b c). An animal with any matched or unmatched pair of the b alleles will have brown, rather than black, hair, a liver nose ...
English: A Punnett Square showing a Bb x Bb cross for eye colour. Here, two heterozygous brown-eyed parents produce 25% homozygous dominant brown-eyed offspring, 75% heterozygous brown-eyed offspring, and 25% homozygous recessive blue-eyed offspring. Notice that, even though both parents are brown-eyed, they may still produce blue-eyed offspring.
Labrador Retrievers are a popular dog breed in many countries. There are three recognised colours, black, chocolate, and yellow, [1] that result from the interplay among genes that direct production and expression of two pigments, eumelanin (brown or black pigment) and pheomelanin (yellow to red pigment), in the fur and skin of the dog.
English: A Punnett Square showing a Bb x bb cross for eye colour. Here, a heterozygous brown-eyed parent and a homozygous recessive blue-eyed parent produce 50% heterozygous brown-eyed offspring and 50% homozygous recessive blue-eyed offspring.
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.
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Here the relation between genotype and phenotype is illustrated, using a Punnett square, for the character of petal color in pea plants. The letters B and b represent genes for color, and the pictures show the resultant phenotypes. This shows how multiple genotypes (BB and Bb) may yield the same phenotype (purple petals).