Punnett Squares

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 are alleles?

Back

Alleles are different forms of a gene that can exist at a specific locus on a chromosome.

Front

What does homozygous mean?

Back

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

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What does heterozygous mean?

Back

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

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What is a phenotype?

Back

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

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, represented by the alleles it possesses.

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.

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What is the recessive trait?

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

Front

How do you determine the expected phenotypic ratio from a Punnett Square?

Back

The expected phenotypic ratio is determined by counting the number of times each phenotype appears in the Punnett Square.

Front

What is the expected phenotypic ratio for a monohybrid cross?

Back

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