Punnett Squares

Front

What are genotypes?

Back

Genotypes are the genetic makeup of an organism, represented by the combination of alleles (e.g., Aa, DD, yy).

Front

What are phenotypes?

Back

Phenotypes are the observable traits or characteristics of an organism, determined by its genotype and environmental factors.

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

How do you set up a Punnett Square?

Back

The genotypes of each parent are placed on the sides, and the possible offspring genotypes are filled in the boxes.

Front

What does it mean for an organism to be heterozygous?

Back

An organism is heterozygous when it has two different alleles for a particular gene (e.g., Rr).

Front

What does it mean for an organism to be homozygous?

Back

An organism is homozygous when it has two identical alleles for a particular gene (e.g., RR or rr).

Front

If black fur is dominant and white fur is recessive, what genotype would an organism with black fur have?

Back

An organism with black fur could be either homozygous dominant (FF) or heterozygous (Ff).

Front

What is the probability of producing a homozygous recessive offspring from a cross between two heterozygous parents?

Back

The probability is 25%.

Front

In pea plants, what does the letter 'R' represent?

Back

The letter 'R' represents the dominant allele for round seeds.

Front

In pea plants, what does the letter 'r' represent?

Back

The letter 'r' represents the recessive allele for wrinkled seeds.