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 homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, either dominant (AA) or recessive (aa).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (Aa).

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous conditions. Dominant alleles are expressed in the phenotype, while recessive alleles are only expressed when homozygous.

Front

If tall (T) is dominant to short (t), what is the phenotype of a plant with genotype Tt?

Back

The phenotype of a plant with genotype Tt is tall.

Front

What is the probability of producing a homozygous recessive offspring from a Tt x Tt cross?

Back

The probability is 25%.

Front

In a genetic cross, 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 expected phenotypic ratio of a monohybrid cross?

Back

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

Front

What does it mean if an organism is described as 'purebred'?

Back

A purebred organism has a homozygous genotype, meaning it has two identical alleles for a trait.

Front

What is the significance of a test cross?

Back

A test cross is used to determine the genotype of an organism with a dominant phenotype by crossing it with a homozygous recessive organism.