Punnett Squares

What is the significance of the 50% contribution from each parent in genetics?

• Each parent contributes 50% of the genetic material to their offspring, resulting in a combination of traits.

• Each parent contributes 25% of the genetic material, leading to a mix of traits.

• The contribution is only significant in dominant traits, not recessive ones.

• Genetic contribution from parents is irrelevant to the traits of the offspring.

What does it mean if an organism is homozygous recessive?

• It means the organism has two dominant alleles for a trait, such as BB.

• It means the organism has one dominant and one recessive allele for a trait, such as Bb.

• It means the organism has two recessive alleles for a trait, such as bb.

• It means the organism has no alleles for that trait.

What is the purpose of using a Punnett Square in genetics?

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

• To determine the physical appearance of an organism.

• To analyze the behavior of genes in a population.

• To create a genetic map of an organism.

What does the term 'genotype' refer to?

• The physical appearance of an organism.

• The genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

• The environment in which an organism lives.

• The evolutionary history of an organism.

What is a dominant allele?

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

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

• An allele that does not express its trait in the presence of a recessive allele.

• An allele that is always expressed regardless of the genotype.

If a trait is dominant, what does that imply about its expression in the offspring?

• The trait will not be expressed in the offspring.

• The trait will be expressed only if both alleles are dominant.

• The trait will be expressed in the offspring if at least one dominant allele is present.

• The trait will be expressed only in the absence of recessive alleles.

What is a recessive allele?

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

• An allele that always expresses its trait regardless of the other allele.

• An allele that can mask the expression of another allele.

• An allele that is only found in dominant traits.

What does the term 'phenotype' refer to?

• The genetic makeup of an organism.

• The observable characteristics or traits of an organism, determined by its genotype.

• The evolutionary history of an organism.

• The environment in which an organism lives.

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

• 1:1:1

• 1:2:1

• 2:1:1

• 3:1

What is a Punnett Square?

• A diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

• A tool for measuring the height of plants in a garden.

• A method for calculating the age of fossils based on their layers.

• A chart used to track the migration patterns of animals.