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?
A man with genotype Dd marries a woman with genotype dd. What is the probability that their child will be homozygous dominant?
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?
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?
Which of the following best describes a homozygous genotype? (1) Two identical alleles (2) Two different alleles (3) One dominant and one recessive allele (4) No alleles present
Which of the following best explains why Punnett squares are useful in predicting genetic outcomes? (1) They show all possible combinations of alleles (2) They guarantee the outcome (3) They only work for dominant traits (4) They are used for animal breeding only
Which of the following crosses would produce a 1:1 phenotypic ratio in the offspring? (1) AA x aa (2) Aa x aa (3) Aa x Aa (4) AA x Aa
Which of the following is a correct representation of a Punnett square for a cross between Aa and aa? (1) All AA (2) 50% Aa, 50% aa (3) 75% Aa, 25% aa (4) 100% aa
Fill in the blank: In a cross between a homozygous dominant and a heterozygous individual, the probability of producing a homozygous recessive offspring is _____.
Fill in the blank: In a cross between two individuals with genotypes AaBb x AaBb, the number of possible genotype combinations in the offspring is _____.
Fill in the blank: In a monohybrid cross between two heterozygous parents (Aa x Aa), the expected genotypic ratio is _____.
Fill in the blank: The allele that is masked in the heterozygous condition is called the _____ allele.
True or False: A dihybrid cross involves two different genes, each with two alleles.
True or False: A Punnett square can be used to predict the exact outcome of a single genetic cross.
True or False: A Punnett square can be used to predict the probability of an offspring inheriting a particular trait.
True or False: In a test cross, an individual with an unknown genotype is crossed with a homozygous dominant individual.
