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 12
A couple, both with genotype Aa, are planning to have a child. What is the probability that their child will be homozygous dominant?
A cross between two pea plants results in 75% round seeds and 25% wrinkled seeds. What are the likely genotypes of the parents?
A man with genotype XY marries a woman with genotype XX. What is the probability that their child will be male?
A Punnett square for a cross between two individuals with genotypes Bb and bb is shown. What is the probability that an offspring will be homozygous?
A woman with genotype Bb marries a man with genotype bb. What is the probability that their child will have the genotype Bb?
Describe how a test cross can be used to determine the genotype of an individual with a dominant phenotype.
Describe how Punnett squares can be used to explain Mendel's laws of inheritance.
Describe the difference between genotype and phenotype using an example.
Explain why linked genes do not assort independently in a dihybrid Punnett square.
Explain why the results of a Punnett square are considered probabilities and not certainties.
If a homozygous dominant plant (TT) is crossed with a homozygous recessive plant (tt), what will be the genotype of all F1 offspring?
If a parent is homozygous dominant (AA) and the other is heterozygous (Aa), what percentage of their offspring will show the dominant phenotype?
If a parent with genotype Aa is crossed with a parent with genotype aa, what are the possible genotypes of the offspring?
If a trait is controlled by incomplete dominance, what would be the phenotype of an individual with genotype Rr, where RR is red and rr is white?
If a trait is sex-linked and recessive, and a carrier female (XXXx) is crossed with a normal male (XY), what is the probability that a son will have the trait?
If two parents are both heterozygous for a trait (Rr x Rr), what is the expected genotypic ratio among their offspring?
If two parents with blood types AB and O have children, what are the possible blood types of their offspring?
In a dihybrid cross between two individuals heterozygous for both traits (AaBb x AaBb), what is the expected phenotypic ratio among the offspring?
What is a Punnett square and what is its primary use in genetics?
What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents (Aa x Aa)?
