Punnett Squares

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

• 50% green, 50% yellow

• 75% green, 25% yellow

• 100% green

• 25% green, 75% yellow

What is the purpose of a Punnett Square?

• To visualize and predict the genetic outcomes of a cross.

• To calculate the probability of winning a game.

• To measure the height of plants in a garden.

• To determine the age of fossils.

What does the genotype 'GG' represent?

• Homozygous dominant genotype for a trait.

• Heterozygous genotype for a trait.

• Homozygous recessive genotype for a trait.

• A genotype with no dominant or recessive traits.

What is a dominant allele?

• An allele that expresses its trait even when only one copy is present.

• An allele that only expresses its trait when two copies are present.

• An allele that has no effect on the phenotype.

• An allele that can be masked by a recessive allele.

What does the genotype 'Gg' represent?

• Homozygous dominant genotype for a trait.

• Homozygous recessive genotype for a trait.

• Heterozygous genotype for a trait.

• A genotype that does not express any trait.

What does it mean if an organism is homozygous for a trait?

• It has two identical alleles for that trait.

• It has two different alleles for that trait.

• It has one dominant and one recessive allele for that trait.

• It has no alleles for that trait.

What is the expected genotype ratio from a cross between two heterozygous parents (Gg x Gg)?

• 1 GG : 2 Gg : 1 gg

• 1 GG : 1 Gg : 2 gg

• 3 Gg : 1 gg

• 1 GG : 3 Gg

How many alleles does each person carry for a trait?

• 1 allele for each trait.

• 2 alleles for each trait.

• 3 alleles for each trait.

• 4 alleles for each trait.

What is the expected phenotype ratio from a cross between a heterozygous parent and a homozygous dominant parent (Gg x GG)?

• 100% green.

• 75% green, 25% yellow.

• 50% green, 50% yellow.

• 100% yellow.

What does it mean if an organism is heterozygous for a trait?

• It has two identical alleles for that trait.

• It has two different alleles for that trait.

• It has one dominant allele and one recessive allele for that trait.

• It has no alleles for that trait.