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 the term 'allele' mean?

Back

An allele is a variant form of a gene that can produce different traits.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable traits or characteristics.

Front

What does homozygous mean?

Back

Homozygous means having two identical alleles for a particular gene (e.g., TT or tt).

Front

What does heterozygous mean?

Back

Heterozygous means having two different alleles for a particular gene (e.g., Tt).

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present (e.g., T in Tt).

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-2

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present (e.g., tt).

Tags

NGSS.HS-LS3-2

Front

How do you determine the possible genotypes of offspring using a Punnett Square?

Back

By filling in the Punnett Square with the alleles from each parent, you can see all possible combinations of alleles for the offspring.

Front

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

Back

The expected genotype ratio is 1 TT : 2 Tt : 1 tt.

Front

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

Back

The expected phenotype ratio is 3 tall : 1 short.