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A Punnett Square is a visual tool used by scientists to determine the possible combinations of genetic alleles in a cross. Since genes are inherited randomly ...
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A Punnett Square is a visual tool used by scientists to determine the possible combinations of genetic alleles in a cross. Since genes are inherited randomly and independently, Punnett Squares are useful for looking at just one gene combination (monohybrid) or a whole series of combinations (dihybrid for two traits, etc.) To make a Punnett Square, draw a box and then divide it into four smaller squares. On the top of the box write the letters that correspond with the alleles for one parent. Write the alleles for the other parent along the left side of the box. Use an upper case letter for a dominant allele and a lower case letter for a recessive allele. Fill in the smaller squares with the alleles from the corresponding rows and columns. The resulting alleles combinations are the possible genotypes for the offspring from that cross.
A green pea plant (GG) is being crossed with a green pea plant (Gg).
Use the provided Punnett Squares to determine the genotypes and phenotypes of each cross.
g Gg Gg Genotypes: 50% GG, 50% Gg Phenotypes: 100% green