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 homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as AA or aa.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Aa.

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles are expressed in the phenotype even when only one copy is present, while recessive alleles are only expressed when two copies are present.

Front

If a Punnett Square has 4 boxes, what percentage does each box represent?

Back

Each box represents 25% of the possible outcomes.

Front

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

Back

Count the number of boxes that show the desired genotype and divide by the total number of boxes.

Front

What is the significance of the yellow box in a Punnett Square?

Back

The yellow box often represents a specific genotype that is being asked for in a question.

Front

What is the genotype of a homozygous recessive individual?

Back

The genotype of a homozygous recessive individual is represented as 'aa' or 'dd'.