Punnett Squares

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from two parents.

Front

Why do scientists use Punnett Squares?

Back

To determine possible genotypes for offspring.

Front

What does a heterozygous genotype mean?

Back

A genotype consisting of two different alleles for a trait, such as Gg.

Front

What is a homozygous recessive genotype?

Back

A genotype with two identical recessive alleles, such as dd.

Front

What is a homozygous dominant genotype?

Back

A genotype with two identical dominant alleles, such as XX.

Front

What does the letter 'G' represent in a Punnett Square for frog skin color?

Back

'G' represents green skin.

Front

What does the letter 'g' represent in a Punnett Square for frog skin color?

Back

'g' represents brown skin.

Front

If a frog has the genotype Gg, what is its phenotype?

Back

The phenotype is green skin.

Front

What is the probability of getting a brown-skinned frog (gg) from a Gg x Gg cross?

Back

25%.

Front

What is the probability of getting a green-skinned frog (GG or Gg) from a Gg x Gg cross?

Back

75%.