The punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. the punnett square below examines the chance of offspring having freckles, which is a dominant trait. a punnett square is shown. the columns are labeled upper f and f. the rows are labeled upper f and f. clockwise from upper left the boxes contain: upper f upper f, upper f f, upper f f, f f. based on the punnett square, what is the probability that the offspring will have freckles?

According to the description, the punnet square can be drawn as follows:

        F        f

F    FF        Ff

f     Ff        ff

The results of the punnet squares show that  there is a 75% chance for the children to have freckles. As freckles is a trait which can arise from just a single allele, hence we can say that is is a dominant trait.

The children from this cross have 25% chance of being homozygous for the freckles trait. There is a 50% chance that the children will be heterozygous for freckles trait and there is a 25% chance that the children will not have freckles.

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carbon

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