Punnett Square

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 having two identical alleles for a particular gene (e.g., AA or aa).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Aa).

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., AA, Aa, or aa).

Front

What is a phenotype?

Back

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

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in a heterozygous genotype. For example, in the case of fur color, black fur (B) is dominant over white fur (b).

Front

If an organism has the genotype 'ff', what is its phenotype?

Back

The phenotype of an organism with the genotype 'ff' would be white fur, as white fur is recessive.

Front

What are the possible genotypes for offspring from a cross between a homozygous dominant (AA) and a homozygous recessive (aa) parent?

Back

The possible genotype for the offspring would all be heterozygous (Aa).

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 expected phenotype ratio from a monohybrid cross between two heterozygous parents (Aa x Aa)?

Back

The expected phenotype ratio is 3:1, with 3 showing the dominant trait and 1 showing the recessive trait.