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.
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?
If a Punnett square for a dihybrid cross (RrYy x RrYy) is completed, what is the expected phenotypic ratio among the offspring?
Which of the following best describes a homozygous genotype? (1) Two identical alleles (2) Two different alleles (3) Only one allele (4) No alleles
Which of the following best describes the purpose of a dihybrid cross Punnett square? (1) To study one trait (2) To study two traits at the same time (3) To study three traits (4) To study only dominant traits
Which of the following best explains why Punnett squares are important in genetics? (1) They show the exact number of offspring (2) They predict possible genetic outcomes (3) They determine the age of an organism (4) They measure DNA directly
Which of the following is a limitation of the Punnett square? (1) It cannot predict probabilities (2) It only works for one gene at a time (3) It cannot be used for humans (4) It is not used in genetics
Fill in the blank: In a cross between a homozygous dominant and a heterozygous individual, the probability of a dominant phenotype in the offspring is __________%.
Fill in the blank: In a dihybrid cross, the Punnett square has __________ boxes.
Fill in the blank: In a monohybrid cross, the Punnett square has __________ boxes.
Fill in the blank: In a Punnett square, each box represents a possible __________ for the offspring.
True or False: A Punnett square can be used to predict the outcome of a cross involving incomplete dominance.
True or False: A Punnett square can be used to predict the probability of inheriting a genetic disorder.
True or False: In a Punnett square, each box represents a possible zygote.
True or False: In a Punnett square, the alleles from one parent are written along the top and the alleles from the other parent are written along the side.
