Punnett Squares & Heredity

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 'dominant' mean in genetics?

Back

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

Front

What does 'recessive' mean in genetics?

Back

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

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 homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait (e.g., AA or aa), while heterozygous means having two different alleles for a trait (e.g., Aa).

Front

If tall (T) is dominant to short (t), what is the phenotype of TT?

Back

The phenotype of TT is tall.

Front

If a plant has the genotype Tt, what are the possible phenotypes?

Back

The possible phenotypes are tall (T) and short (t), but Tt will show as tall.

Front

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

Back

The probability is 25%.

Front

In a cross between Bb and bb, what is the probability of getting brown fur?

Back

The probability of getting brown fur is 50%.