U5 Lesson 5.3 Punnett Squares

What is the probability of getting heads in a coin toss?

• 25%

• 75%

• 100%

• 50%

What must be known to use a Punnett square effectively?

• The weather conditions

• The genotypes of the parents

• The favorite color of the breeder

• The age of the plants

What does a Punnett square predict?

• Genotypes and phenotypes of offspring

• Weather patterns

• Soil quality for plants

• The best plant fertilizers

How are alleles represented in a Punnett square?

• Using numbers

• Using shapes

• Using capital and lowercase letters

• Using colors

In a Punnett square, how do you list the alleles?

• Alphabetically

• Dominant first

• Randomly

• Recessive first

What is the phenotype ratio of offspring from two heterozygous pea plants?

• 4:1

• 1:1

• 2:1

• 3:1

What does a 3:1 phenotype ratio imply about the offspring?

• Three out of four offspring are tall

• Half of the offspring are tall

• One out of three offspring is short

• All offspring are tall

Why can't you expect a group of four seeds to have three tall plants and one short plant?

• Because each offspring's phenotype is independent

• Because all seeds will grow into tall plants

• Because the seeds might not germinate

• Because the ratio only applies to large numbers

What is the probability that the offspring will be tall when crossing a purebred tall plant with a purebred short plant?

• 25%

• 50%

• 75%

• 100%

What outcome is guaranteed from crossing two purebred plants of opposite traits?

• A mix of traits

• All offspring with dominant traits

• All offspring with recessive traits

• Unpredictable outcomes