Fill-in Punnett Square Practice

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., BB, Bb, bb).

Front

What does a Punnett Square illustrate?

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 are alleles?

Back

Alleles are different forms of a gene that can exist at a specific locus on a chromosome (e.g., A and a for hair color).

Front

What is the phenotype?

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

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 parental alleles.

Front

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

Back

The expected genotype ratio is 1 BB : 2 Bb : 1 bb.

Front

What is the expected phenotype ratio from a monohybrid cross of two heterozygous parents (Bb x Bb) if B is dominant?

Back

The expected phenotype ratio is 3 brown hair : 1 blond hair.

Front

What does the term 'dominant allele' mean?

Back

A dominant allele is an allele that expresses its phenotype even when only one copy is present (e.g., B in Bb).