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 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?
Which of the following best describes a monohybrid cross? (1) A cross involving one gene with two alleles (2) A cross involving two genes (3) A cross involving three alleles (4) A cross involving only dominant alleles
Which of the following crosses would produce only heterozygous offspring? (1) AA x aa (2) Aa x Aa (3) AA x Aa (4) aa x aa
Which of the following genotypes is heterozygous? (1) AA (2) Aa (3) aa (4) Both AA and aa
Which of the following is a correct statement about Punnett squares? (1) They can be used for polygenic traits (2) They are only useful for monohybrid crosses (3) They cannot be used for sex-linked traits (4) They always predict exact outcomes
Fill in the blank: In a dihybrid cross, the law of __________ states that alleles of different genes assort independently of one another.
Fill in the blank: In a Punnett square, the combination of alleles in each box represents a possible __________ for the offspring.
Fill in the blank: The allele that is masked in the heterozygous condition is called the __________ allele.
Fill in the blank: The expected phenotypic ratio for a monohybrid cross between two heterozygotes is __________.
True or False: A Punnett square can be used to predict the actual outcome of a genetic cross.
True or False: Codominance can be represented in a Punnett square.
True or False: In a Punnett square, each box represents a possible genotype of an offspring.
True or False: In a Punnett square, the alleles from one parent are written across the top and the alleles from the other parent are written down the side.
