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 do the letters G and g represent in genetics?

Back

In genetics, uppercase letters (like G) represent dominant alleles, while lowercase letters (like g) represent recessive alleles.

Front

What is the genotype for a yellow plant if G = green and g = yellow?

Back

gg

Front

If brown eyes are dominant over blue eyes, what is the probability of offspring having brown eyes from a cross of Bb x bb?

Back

50%.

Front

What does homozygous recessive mean?

Back

Homozygous recessive means having two identical recessive alleles for a trait, such as 'tt' for shortness.

Front

In a Punnett Square, what does each box represent?

Back

Each box represents a possible genotype of the offspring resulting from the combination of alleles from the parents.

Front

What is the ratio of offspring that will be homozygous recessive from a cross of Tt x Tt?

Back

1 in 4.

Front

What is the genotype for a purebred tall plant?

Back

TT.

Front

What is the phenotype of a plant with the genotype Tt?

Back

Tall, because T (tall) is dominant over t (short).

Front

What does it mean if an organism is heterozygous?

Back

An organism is heterozygous if it has two different alleles for a trait, such as 'Tt'.