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 it mean for an allele to be dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

Front

What does it mean for an allele to be recessive?

Back

A recessive allele is one that only expresses its trait when two copies are present in the genotype.

Front

What is the genotype of an organism?

Back

The genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

What is the phenotype of an organism?

Back

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

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., BB or bb).

Front

What does heterozygous mean?

Back

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

Front

How many possible gametes can be produced from a genotype Bb?

Back

Two possible gametes: B and b.

Front

If a black-furred mouse (Bb) is crossed with a white-furred mouse (bb), what are the possible offspring genotypes?

Back

Possible offspring genotypes: Bb (black) and bb (white).

Front

What is the expected phenotypic ratio of a monohybrid cross?

Back

The expected phenotypic ratio of a monohybrid cross is 3:1 for dominant to recessive traits.