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 10
A cross between a black chicken (BB) and a white chicken (WW) produces all blue offspring (BW). What type of inheritance is this?
A cross between two heterozygous individuals (Rr x Rr) results in what genotypic ratio?
A man with blood type AO and a woman with blood type BO have a child. What are the possible blood types of their offspring?
A woman with genotype XBXb and a man with genotype XbY have a child. What is the probability that the child will be a colorblind son?
Describe the difference between genotype and phenotype.
Describe what is meant by a test cross and its purpose.
Explain the difference between a monohybrid and a dihybrid cross.
Explain why Punnett squares are important in predicting genetic outcomes.
If a dihybrid cross is made between two individuals with genotype RrYy, what is the probability of getting an offspring with genotype rryy?
If a heterozygous tall plant (Tt) is crossed with a homozygous short plant (tt), what are the possible genotypes of the offspring?
If a parent has genotype Bb and another has genotype bb, what are the possible genotypes of their offspring?
If a parent is homozygous recessive for a trait, what alleles will they pass on to their offspring?
If a trait is controlled by incomplete dominance, what would be the phenotype of an offspring with genotype Rr if RR is red and rr is white?
If two parents are both homozygous dominant for a trait, what is the probability that their offspring will be homozygous recessive?
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 couple, both with genotype Aa for a certain trait, have three children. What is the probability that all three children will be homozygous recessive?
A geneticist is studying a trait controlled by codominance. If a parent with genotype MN is crossed with a parent with genotype NN, what are the possible genotypes of the offspring?
A plant with genotype AaBb is crossed with a plant with genotype aabb. What is the probability that an offspring will have the genotype AaBb?
A woman who is heterozygous for a recessive genetic disorder (Dd) marries a man who is also heterozygous (Dd). What is the probability that their child will be affected by the disorder?
