Punnett Square Practice

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 the term 'genotype' refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous genotypes have two identical alleles (e.g., AA or aa), while heterozygous genotypes have two different alleles (e.g., Aa).

Front

What does 'dominant allele' mean?

Back

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

Front

What does 'recessive allele' mean?

Back

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

Front

If a plant has the genotype Bb, what are the possible gametes it can produce?

Back

The possible gametes are B and b.

Front

In a cross between two heterozygous plants (Bb x Bb), what is the probability of obtaining a homozygous recessive offspring?

Back

The probability is 25%.

Front

What is the phenotype of a plant with the genotype AA?

Back

The phenotype is the dominant trait, which in this case would be expressed as purple if purple is dominant.

Front

How do you determine the probability of an offspring's genotype using a Punnett Square?

Back

You fill in the Punnett Square with the alleles from each parent and then count the combinations for each genotype.

Front

What is the expected ratio of phenotypes in a monohybrid cross?

Back

The expected ratio is typically 3:1 for dominant to recessive traits.