subject

Punnett Squares

Biology ⇒ Genetics and Heredity

Punnett Squares starts at 8 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Punnett Squares. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 8
If a cross between two parents results in 100% dominant phenotype, what can you infer about the parents' genotypes?
If a parent has genotype Aa and another has genotype aa, what are the possible genotypes of their offspring?
If a parent is homozygous recessive (aa), what type of gametes can it produce?
If a Punnett square shows 50% Tt and 50% tt, what were the genotypes of the parents?
If a Punnett square shows 75% dominant phenotype and 25% recessive phenotype, what is the likely genotype of the parents?
If a Punnett square shows all offspring as Tt, what were the genotypes of the parents?
If a tall plant (Tt) is crossed with a short plant (tt), what are the possible genotypes of the offspring?
If both parents are homozygous dominant (AA x AA), what is the genotype of all offspring?
If two heterozygous parents (Bb x Bb) are crossed, what is the probability of getting a homozygous dominant offspring?
What is a Punnett square used for in genetics?
What is the probability of getting a homozygous recessive offspring when two heterozygous parents (Tt x Tt) are crossed?
A plant with genotype RrYy (where R = round, r = wrinkled, Y = yellow, y = green) is crossed with a plant with genotype rryy. Using a Punnett square, what is the probability that an offspring will have round and yellow seeds?
A scientist is studying a trait controlled by incomplete dominance. If a red-flowered plant (RR) is crossed with a white-flowered plant (WW), what will be the phenotype of the offspring?
A woman with genotype Bb (B = brown eyes, b = blue eyes) and a man with genotype bb have children. What is the chance that their child will have blue eyes?
Explain why the results predicted by a Punnett square may not always match the actual results observed in offspring.
If a Punnett square for a cross between two parents shows a 1:1 ratio of two different phenotypes, what can you infer about the genotypes of the parents?