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?
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?
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
Which of the following best explains why Punnett squares are not always accurate in real populations?
(1) They ignore environmental effects
(2) They assume random mating
(3) They do not account for mutations
(4) All of the above
Which of the following best represents a heterozygous genotype?
(1) AA
(2) aa
(3) Aa
(4) None of the above
Which of the following is a possible outcome of a cross between a homozygous dominant and a homozygous recessive individual?
(1) All heterozygous
(2) All homozygous dominant
(3) All homozygous recessive
(4) All genotypes possible
Fill in the blank: In a dihybrid cross, the typical phenotypic ratio in the F2 generation is __________.
Fill in the blank: In a Punnett square, each box shows a possible __________ of the offspring.
Fill in the blank: In a Punnett square, the alleles from one parent are written across the __________, and the alleles from the other parent are written down the __________.
Fill in the blank: The allele that is masked in the presence of a dominant allele is called __________.
True or False: A Punnett square can be used for both monohybrid and dihybrid crosses.
True or False: A Punnett square can be used to predict the probability of inheriting a genetic disorder.
True or False: In a monohybrid cross, only one trait is considered at a time.
True or False: In a Punnett square, each box represents a possible genotype for an offspring.
