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 homozygous mean?

Back

Homozygous refers to an organism that has two identical alleles for a particular trait.

Front

What does heterozygous mean?

Back

Heterozygous refers to an organism that has two different alleles for a particular trait.

Front

What is the genotype of an organism?

Back

The genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

What is the phenotype of an organism?

Back

The phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What is the term for an organism with two different alleles for a trait?

Back

Heterozygous.

Front

If T = tall and t = short, what is the phenotype of a Tt plant?

Back

The phenotype of a Tt plant is tall.

Front

What is the expected genotype ratio from a cross between two heterozygous parents (Tt x Tt)?

Back

1 TT : 2 Tt : 1 tt.

Front

What is the expected phenotype ratio from a cross between two heterozygous parents (Tt x Tt)?

Back

3 tall : 1 short.

Front

What does it mean if an organism is homozygous recessive?

Back

It means the organism has two recessive alleles for a trait, such as 'tt' for short plants.