Punnett Squares

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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.

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What is an allele?

Back

An allele is a variant form of a gene that can produce different traits.

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What does homozygous mean?

Back

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

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What does heterozygous mean?

Back

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

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What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the combination of alleles (e.g., DD, Dd, dd).

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What is a phenotype?

Back

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

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What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present (e.g., D in Dd).

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What is a recessive allele?

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A recessive allele is an allele that only expresses its trait when two copies are present (e.g., dd).

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What is the purpose of a Punnett Square?

Back

The purpose of a Punnett Square is to predict the probability of offspring inheriting particular traits from their parents.

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What is the difference between genotype and phenotype?

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Genotype refers to the genetic makeup (alleles), while phenotype refers to the physical expression of those genes.