Punnett Squares and Heredity*

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 genotype mean?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

Tags

NGSS.HS-LS1-1

Front

What does phenotype mean?

Back

Phenotype is the physical appearance or visible traits of an organism, resulting from the interaction of its genotype with the environment.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous means having two identical alleles for a trait (e.g., AA or aa), while heterozygous means having two different alleles for a trait (e.g., Aa).

Front

If a blue-eyed woman (bb) marries a heterozygous man (Bb), what is the chance of having a blue-eyed baby?

Back

50% chance.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Front

What is a purebred organism?

Back

A purebred organism has a genotype that is homozygous for a specific trait, meaning it has two identical alleles (e.g., PP or pp).

Front

What is the probability of two heterozygous parents (Bb) having a blue-eyed baby?

Back

25% chance.

Tags

NGSS.HS-LS3-3

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that is expressed in the phenotype even if only one dominant allele is present (e.g., B in Bb).

Front

What does it mean if a trait is recessive?

Back

A recessive trait is only expressed in the phenotype if two recessive alleles are present (e.g., bb).

Tags

NGSS.HS-LS3-1

Front

What is the chance of a homozygous dominant woman (BB) and a man with freckles (ff) having a freckled baby?

Back

0% chance.

Tags

NGSS.HS-LS3-1