A Punnett Square helps scientists predict the possible genotypes and phenotypes of offspring when they know the genotypes of the parents. Practicing the Punnett Square with the diagram, this 8 multiple choice questions are sure to help you revise to a higher level.

If an organism is said to have a genotype of "aa", which of the following then best describes it?

If round seeds (R) are dominant to wrinkled seeds, which best describes a seed that's heterozygous?

Yellow flowers (Y) are dominant to white flowers. Which best describes a white flower?

Yellow flowers (Y) are dominant to white flowers. Which best describes a genotype of "Yy"?

What is the phenotype of the heterozygous parent in the punnett square?

B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.

they have same phenotype but different genotypes

they have same genotype but different phenotypes

they have different genotypes and phenotypes

An offspring will receive how many alleles from each parent to determine a specific trait?

What is the possibility of this offspring having the dominant trait?

Punnett Square Practice

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Punnett Square Practice

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