Punnett Squares

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from a particular cross or breeding experiment.

Front

What does homozygous dominant mean?

Back

Homozygous dominant refers to an organism that has two identical dominant alleles for a trait (e.g., AA).

Front

What does homozygous recessive mean?

Back

Homozygous recessive refers to an organism that has two identical recessive alleles for a trait (e.g., aa).

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, represented by the alleles inherited from the parents.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What is a phenotype?

Back

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

Front

What is the purpose of a Punnett Square?

Back

The purpose of a Punnett Square is to visualize the possible genetic combinations from a cross and to calculate the probabilities of each genotype.

Tags

NGSS.HS-LS3-3

Front

If a Punnett Square shows 4 boxes, what does that indicate?

Back

It indicates that there are four possible combinations of alleles from the parents.

Front

What is the expected percentage of offspring with a homozygous dominant genotype from a cross of AA x Aa?

Back

50%.

Tags

NGSS.HS-LS3-3

Front

What is the expected percentage of offspring with a homozygous recessive genotype from a cross of Aa x Aa?

Back

25%.

Tags

NGSS.HS-LS3-3

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 each parent.