Punnett Squares — Examples & Diagrams
Read this topicExplanations 4
- What Is a Punnett Square? A Punnett square is a method used to predict the outcomes of certain crosses between organisms. This method uses the genotypes of two parent organisms …
By Samantha Broders, Alex Federspiel, Deena Hauze, Gabi Slizewska, Mario Janakis
- What Are Punnett Squares? They are a tool used to figure out the possible allele combinations of a genetic cross. A genetic cross is a fancy way of talking about two parents' ge…
By Deena Hauze, Alex Federspiel, Gabi Slizewska, Mario Janakis
- (Video) Punnett Square Basics by 2 Minute Classroom In this video, 2 Minute Classroom explains how to draw a useful tool for determining offspring genotypes.
By Deena Hauze, Mario Janakis
- How to Read a Punnett Square A Punnett square is made to show inheritance patterns in a genetic cross. But you have to know how to read one to understand one. So, let's cover wh…
By Valeri Natole, Mario Janakis
Problems 47
- How would you describe the genotypes of both parents in this cross?
- What percentage of offspring would be homozygous recessive when you crossed rr x Rr?
- How many homozygous offspring are there in this punnett square?
- What percent of offspring will be heterozygous you if you crossed a BB father and bb mother?
- Look at the punnet square above. What should be in the blank box?
- Look at the Punnett square above. What should be in the blank box?
- The punnet square above shows the possible genotypes of the offspring from two plants. However, the genotype of the pollen is unknown. Using the information from the offspring, …
- If one parent is homozygous dominant and the other is homozygous recessive, how likely is having a heterozygous offspring?
- What type of letter is used to represent a dominant trait?
- Brown fur is dominant over white fur in rabbits. If a heterozygous (Bb) rabbit mates with a homozygous white rabbit (bb), what is the probability of them having brown offspring?…
- What is the likelihood of a homozygous recessive rabbit and a homozygous dominant rabbit having homozygous offspring?
- What is the probability of two heterozygous (Yy) parents having a heterozygous offspring?
- What would the genotypes of the offspring of these parents be?
- What would the genotypes of the offspring be?
- What is an allele?
- What percent of the offspring in this punnett square would be homozygous?
- If the two circled ponies had offspring, what percent would be heterozygous for the gene?
- Polydactyly is the condition of having more than 5 fingers on a hand or toes on a foot. It is an autosomal dominant condition. If a woman who is homozygous recessive for polydac…
- Tone deafness is an autosomal dominant trait (D). A man with genotype Dd and a woman with genotype Dd have a son with who is not tone deaf. What is the probability that their se…
- Tay Sachs is an autosomal recessive disease found in children. A female with genotype Tt and a male with genotype Tt have 2 children. What is the probability that both children …
- Look at the figure above. What percentage of offspring from the dihybrid cross will be dominant for both traits?
- In a certain flower, red petal color (R) is dominant to pink (r). Also, long stems (L) are dominant to short (l). A scientist crosses a flower that is heterozygous for both trai…
- Sickle cell anemia is an autosomal recessive disease. A man who is heterozygous for the trait has 2 children with a woman who is also heterozygous for the trait. What is the pro…
- The inheritance of dimples is very irregular. However, the trait is generally considered to be dominant. A man who is homozygous recessive for the trait has 3 children with a wo…
- A rare flower discovered in New Zealand produces flowers that are either white or red, where white is the dominant color. Two heterozygous flowers are crossed. What percentage o…
- Use the diagram above. When creating a Punnett square, where would you write the genotypes of the parents?
- In the Punnett square above, Parent 1 has genotype Aa. What do the single letters (A, a) represent?
- In the Punnett square above, what is the genotype of Parent 2?
- In cats, short hair is generally dominant to long hair. If two heterozygous cats mate, what is the probability that their offspring will have long hair?
- The Punnett square above shows the genotypes of the offspring. However, it's missing the genotypes of the parents. Can you figure out what those genotypes are?
- Achoo Syndrome is a condition which causes a person to sneeze when they are suddenly exposed to bright light. It is caused by the dominant allele for the gene. If a man doesn't …
- What is a P generation?
- Which of the following scientists is known for working with the inheritance patterns in pea plants, and is often called the "father of genetics"?
- What is the name for the first generation of offspring when performing genetic crosses?
- What type of cross looks at two traits at the same time?
- Which of the following states that during meiosis alleles separate into gametes so that each parent contributes only one allele for each gene?
- Which of the following states that each trait is inherited independently of other traits?
- What type of cross is shown in above?
- Use the information above to create a Punnett square for a cross between Parent 1 (BbCc) and Parent 2 (bbCC). What is the probability that the parents will have a child with blu…
- What type of inheritance pattern is observed in the Punnett square above?
- A scientist crosses two fruit flies to study the inheritance pattern of wing shape. The F1_11 generation consists of 143 flies. After further research, it becomes clear that a …
- What type of cross is used to observe two traits at the same time?
- If both parents are homozygous dominant for a trait, what is the probability that their child will also be homozygous dominant for that trait?
- What is the probability that two heterozygous parents will have a homozygous child?
- How long will it take the recessive PTC non-tasting trait to disappear from the gene pool? In other words, how long until the population contains no NN genotypes?
- Using the diagram of a Punnett square above, where would you put the genotypes of the offspring?
- If one parent is heterozygous for a trait and the other is homozygous recessive, what is the probability that the offspring will be homozygous recessive?