Punnett Squares

Front

What is a Punnett square?

Back

A Punnett square is a graphical representation used to predict the possible genotypes of offspring resulting from a genetic cross.

Front

How are dominant alleles represented in genetic notation?

Back

Dominant alleles are represented by capital letters.

Front

What is the probability of a blue-eyed baby from two brown-eyed parents (Bb)?

Back

The probability is 25%.

Front

What phenotype do AA and Aa genotypes express?

Back

Both AA and Aa genotypes express the dominant phenotype.

Front

Which genotype represents a homozygous (purebred) recessive trait?

Back

The genotype 'tt' represents a homozygous recessive trait.

Front

What does it mean for an allele to be dominant?

Back

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

Front

What does it mean for an allele to be recessive?

Back

A recessive allele only expresses its trait when two copies are present in the genotype.

Front

In a Punnett square, what do the rows and columns represent?

Back

The rows represent the alleles from one parent, and the columns represent the alleles from the other parent.

Front

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

Back

The expected genotype ratio is 1 BB : 2 Bb : 1 bb.

Front

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

Back

The expected phenotype ratio is 3 dominant : 1 recessive.