Punnett Square Credit Genetics and 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 does homozygous dominant mean?

Back

Homozygous dominant refers to having two identical dominant alleles for a trait, represented as 'AA'.

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What does heterozygous mean?

Back

Heterozygous means having two different alleles for a trait, represented as 'Aa'.

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What does homozygous recessive mean?

Back

Homozygous recessive refers to having two identical recessive alleles for a trait, represented as 'aa'.

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What is a dominant trait?

Back

A dominant trait is one that is expressed in the phenotype even when only one dominant allele is present.

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What is a recessive trait?

Back

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

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How do you calculate the percentage of offspring with a specific genotype using a Punnett Square?

Back

Count the number of squares representing the genotype of interest and divide by the total number of squares, then multiply by 100.

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What is the genotype of a parent that is heterozygous?

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The genotype of a heterozygous parent is represented as 'Aa'.

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What is the phenotype of a homozygous dominant individual?

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The phenotype of a homozygous dominant individual will always express the dominant trait.

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What is the phenotype of a homozygous recessive individual?

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The phenotype of a homozygous recessive individual will express the recessive trait.