Punnett Squares and Pedigrees

What is the ratio of genotypes in a monohybrid cross of Bb x Bb?

• 1 BB : 1 Bb : 1 bb

• 1 BB : 2 Bb : 1 bb

• 2 BB : 1 Bb : 1 bb

• 3 BB : 1 bb : 1 Bb

What does the letter 'B' represent in genetics?

• A recessive allele, such as blonde hair.

• A dominant allele, such as brown hair.

• A type of genetic mutation.

• A specific chromosome number.

What is the phenotype of an individual with the genotype bb?

• Blonde hair

• Brown hair

• Black hair

• Red hair

What is the probability of an offspring having brown hair if the parents are Bb and Bb?

• 50%

• 75%

• 25%

• 100%

What does a filled circle represent in a pedigree chart?

• An Unaffected Female

• An Affected Female

• An Affected Male

• An Unaffected Male

What does it mean if a trait is dominant?

• A dominant trait is expressed in the phenotype even if only one copy of the allele is present.

• A dominant trait requires two copies of the allele to be expressed.

• A dominant trait is only expressed in the absence of recessive traits.

• A dominant trait can be masked by a recessive trait.

What does it mean if a trait is recessive?

• A recessive trait is expressed in the phenotype only if two copies of the allele are present.

• A recessive trait is always expressed in the phenotype regardless of the allele copies.

• A recessive trait can be expressed with just one copy of the allele present.

• A recessive trait is dominant over other traits in the phenotype.

What does each box in a Punnett Square represent?

• Each box represents a 50% probability of an offspring's genotype.

• Each box represents a 25% probability of an offspring's genotype.

• Each box represents a 75% probability of an offspring's genotype.

• Each box represents a 100% probability of an offspring's genotype.

What does an open circle represent in a pedigree chart?

• Affected Male

• Not Affected Female

• Affected Female

• Not Affected Male

What does the letter 'b' represent in genetics?

• A dominant allele, such as brown hair.

• A recessive allele, such as blonde hair.

• A gene that determines eye color.

• A chromosome type.