Punnett Squares

Multiple Choice

What is the definition of a Punnett Square?

• A graphic used to predict the results of a genetic cross.

• Having two different alleles for the same gene

• The entire genetic makeup of an organism; also the combination of genes for one or more specific traits.

• In genetics, describes an allele that is fully expressed whenever the allele is present in an individual.

Multiple Select

What are two things to remember when completing a Punnett Square?

• Can be used with one or two parents

• Can only be used with two parents

• Both sides may or may not be used

• Both sides will be used

Fill in the Blanks

In the first Punnett Square you have two parents, one that is homozygous dominant for the allele for brown eyes and one that homozygous recessive that is homozygous

for the allele for blue eyes.

Fill in the Blanks

Each of these punnett squares shows how the

of each allele has the chance to be passed from parent(s) to offspring.

Multiple Choice

How much is the entire Punnett Square worth?

• 25%

• 50%

• 75%

• 100%

Multiple Choice

How much is each individual cell within a Punnett Square worth?

• 25%

• 50%

• 75%

• 100%

Match

Match the term to its correct description.

• Having two identical alleles for the same gene.

• Having two different alleles for the same gene

• In genetics, describes an allele that is fully expressed whenever the allele is present in an individual.

• In genetics, describes an allele that is expressed only when no dominant allele is present in an individual.

• The entire genetic makeup of an organism; also the combination of genes for one or more specific traits.

Homozygous

Heterozygous

Dominant Allele

Recessive Allele

Genotype

• Homozygous

• Heterozygous

• Dominant Allele

• Recessive Allele

• Genotype

Multiple Choice

Based on the Punnett square what is the probability that their offspring will inherit the blue eye color allele?

• 25%

• 50%

• 75%

• 100%

Multiple Choice

Additionally, what is the probability that their offspring will inherit the brown eye color allele?

• 25%

• 50%

• 75%

• 100%

Multiple Choice

The diagram shows an incomplete Punnett square that represents a trait passed from parents to offspring.

What is the perfect chance that the offspring are homozygous dominant for the trait?

• 0%

• 25%

• 50%

• 75%