Punnett Squares
Biology ⇒ Genetics and Heredity
Punnett Squares starts at 8 and continues till grade 12.
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See sample questions for grade 11
A man with genotype Dd marries a woman with genotype dd. What is the probability that their child will be homozygous dominant?
A Punnett square for a cross between Aa and Aa shows four possible genotypes. List them.
A woman with genotype Aa marries a man with genotype aa. What is the probability that their child will have the genotype aa?
A woman with genotype XBXb (carrier for color blindness) marries a man with genotype XbY (color blind). What is the probability that their son will be color blind?
Describe how the law of independent assortment is demonstrated using a dihybrid Punnett square.
Describe the difference between genotype and phenotype.
Describe the steps to construct a Punnett square for a monohybrid cross.
Explain how a Punnett square can be used to determine the probability of a child inheriting a genetic disorder.
Explain why the Punnett square is less accurate for traits controlled by multiple genes (polygenic traits).
Explain why the results of a Punnett square are expressed as probabilities rather than certainties.
If a homozygous dominant plant (TT) is crossed with a homozygous recessive plant (tt), what will be the genotype of all the F1 offspring?
If a parent with genotype Bb is crossed with a parent with genotype bb, what percentage of the offspring are expected to be heterozygous?
If a trait is controlled by incomplete dominance, what would be the phenotype of an individual with genotype Rr, where R = red and r = white?
If a trait shows codominance, what would be the phenotype of an individual with genotype AB, where A and B are both dominant alleles?
If two parents are both heterozygous for a trait (Bb x Bb), what is the probability that their child will be homozygous recessive?
In a dihybrid cross between two individuals heterozygous for both traits (RrYy x RrYy), what is the expected phenotypic ratio in the offspring?
What is a Punnett square used for in genetics?
