Jade creates a Punnett square to show the cross between a parent with freckles and a parent without freckles. The completed Punnett square shows the possible genotypes and phenotypes of the offspring. Jade, however, made a mistake as she was making the Punnett square. In which part of the Punnett square did Jade make her error? Be sure to explain your answer.
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The square in which Jade makes a mistake is the one showing 'ff' and freckles.
Why is this square wrong?
- As we know that freckles are a dominant trait in humans. This means that even in a heterozygous genotype (Ff), freckles will be observed.
- This means that the genotype for which the freckles will be represented are FF or Ff.
- A person who is having both the alleles as f and f will not show freckles.
Based on this understanding we can say that the square showing freckles with 'ff' is wrong.
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The Punnett square's top-right square contains Jade's error. She calls the phenotype freckles in this square, but freckles require at least one dominant allele in the offspring. This box contains ff offspring. The offspring will not have freckles because there is no dominant allele present.
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