Punnett Squares

Front

What is a Punnett Square?

Back

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

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 is one that only expresses its trait when two copies are present in the genotype.

Front

What is the genotype of a purebred dominant individual?

Back

The genotype of a purebred dominant individual is represented as 'AA'.

Front

What is the genotype of a purebred recessive individual?

Back

The genotype of a purebred recessive individual is represented as 'tt'.

Front

What is a heterozygous genotype?

Back

A heterozygous genotype contains two different alleles for a trait, such as 'Bb'.

Front

In a Tt x Tt cross, what is the probability of producing a tall plant?

Back

The probability of producing a tall plant is 75%.

Front

In a Tt x Tt cross, what is the probability of producing a short plant?

Back

The probability of producing a short plant is 25%.

Front

What is the expected phenotypic ratio from a monohybrid cross?

Back

The expected phenotypic ratio from a monohybrid cross is 3:1 for dominant to recessive traits.

Front

How do you determine the probability of a specific genotype in a Punnett Square?

Back

To determine the probability of a specific genotype, count the number of times that genotype appears in the Punnett Square and divide by the total number of outcomes.