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 '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

If G = green and g = yellow, what is the genotype for a green plant?

Back

GG or Gg.

Front

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

Back

75%.

Front

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

Back

25%.

Front

What is the probability of getting a white fur offspring from a cross of Bb x Bb?

Back

25%.

Front

What does it mean if an organism is homozygous?

Back

An organism is homozygous if it has two identical alleles for a trait.