Punnett Squares

What is the purpose of using a Punnett Square?

• To visualize and calculate the probability of different genetic outcomes in offspring.

• To determine the exact traits of an organism.

• To analyze the physical structure of DNA.

• To measure the height of plants in a garden.

In a Punnett Square, what do the letters on the top and side represent?

• The letters represent the alleles contributed by each parent.

• The letters represent the physical traits of the offspring.

• The letters represent the genetic mutations in the parents.

• The letters represent the environmental factors affecting the traits.

What does the term 'genotype' refer to?

• The physical appearance of an organism.

• The genetic makeup of an organism, represented by alleles.

• The environmental factors affecting an organism.

• The evolutionary history of an organism.

If a plant with genotype 'Tt' is crossed with another 'Tt', what is the probability of getting a homozygous recessive offspring?

• 50% of the offspring will be homozygous recessive (tt).

• 25% of the offspring will be homozygous recessive (tt).

• 75% of the offspring will be homozygous recessive (tt).

• 100% of the offspring will be homozygous recessive (tt).

What is the probability of getting a dominant trait if one parent is homozygous dominant (RR) and the other is homozygous recessive (rr)?

• 50% of the offspring will have the dominant trait.

• 75% of the offspring will have the dominant trait.

• 100% of the offspring will have the dominant trait.

• 25% of the offspring will have the dominant trait.

What is the expected phenotype ratio from a cross of two heterozygous parents (Tt x Tt)?

• 1 tall : 1 short

• 2 tall : 2 short

• 3 tall : 1 short

• 4 tall : 0 short

What does the term 'phenotype' refer to?

• The genetic makeup of an organism.

• The observable characteristics or traits of an organism.

• The evolutionary history of an organism.

• The habitat in which an organism lives.

If a trait is represented by 'r', what does it signify?

• 'r' signifies a dominant trait.

• 'r' signifies a recessive trait.

• 'r' signifies a co-dominant trait.

• 'r' signifies an incomplete dominant trait.

In a cross between a heterozygous tall plant (Tt) and a short plant (tt), what is the probability of getting a tall plant?

• 25% of the offspring will be tall.

• 50% of the offspring will be tall.

• 75% of the offspring will be tall.

• 100% of the offspring will be tall.

What is a Punnett Square?

• A diagram used to predict the genetic makeup of offspring from two parents.

• A tool for measuring the height of plants.

• A method for calculating the age of fossils.

• A chart for tracking weather patterns.