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 9
A cross between two pea plants results in 75% tall and 25% short offspring. What are the likely genotypes of the parents?
A Punnett square is set up for a cross between two individuals with genotypes Dd and dd. What is the probability that an offspring will be homozygous recessive?
A Punnett square shows a cross between two pea plants, both with genotype Tt. What fraction of the offspring will have the genotype TT?
Describe the difference between genotype and phenotype using an example from a Punnett square.
Describe the steps to set up a Punnett square for a monohybrid cross.
Describe what information you need before constructing a Punnett square for a genetic cross.
Explain how a Punnett square can be used to determine the probability of a child inheriting a genetic disease.
Explain why the Punnett square is considered a model of probability rather than a guarantee of outcomes.
If a homozygous dominant plant (TT) is crossed with a homozygous recessive plant (tt), what will be the genotype of all the offspring?
If a parent has genotype Aa and another parent has genotype aa, what are the possible genotypes of their offspring?
If a Punnett square for a dihybrid cross (RrYy x RrYy) is completed, what is the expected phenotypic ratio among the offspring?
If a Punnett square is used for a cross between two heterozygous parents (Gg x Gg), what is the probability of an offspring being homozygous dominant?
If a Punnett square is used for a cross between two parents with genotypes Bb and bb, what percentage of the offspring will be heterozygous?
If a Punnett square is used for a cross between two parents with genotypes RR and Rr, what percentage of the offspring will be homozygous dominant?
If a Punnett square shows 50% of the offspring with genotype Aa and 50% with aa, what were the genotypes of the parents?
What is a Punnett square used for in genetics?
What is the probability of getting a homozygous recessive offspring from a cross between two heterozygous parents (Aa x Aa)?
A geneticist is studying a trait controlled by incomplete dominance. If a red-flowered plant (RR) is crossed with a white-flowered plant (WW), what will be the phenotype of the F1 generation?
A woman with blood type AB (genotype IAIB) and a man with blood type O (genotype ii) have children. Using a Punnett square, what are the possible blood types of their offspring?
Explain why the actual ratio of phenotypes observed in offspring may differ from the predicted ratio given by a Punnett square.
