Heredity and Punnett Squares

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses, such as BB, Bb, or bb.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Bb.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as BB (homozygous dominant) or bb (homozygous recessive).

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 is the dominant trait?

Back

The dominant trait is the trait that is expressed in the phenotype when at least one dominant allele is present.

Front

What is the recessive trait?

Back

The recessive trait is the trait that is expressed in the phenotype only when two recessive alleles are present.

Front

If B is for brown hair and b is for blonde hair, what is the phenotype of Bb?

Back

The phenotype of Bb is brown hair, as brown is the dominant trait.

Front

What is the phenotype of a homozygous recessive genotype (bb)?

Back

The phenotype of a homozygous recessive genotype (bb) is blonde hair.

Front

In a Punnett Square, what does each box represent?

Back

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

Front

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

Back

The genotype for a yellow plant is gg.