Punnett Squares and Pedigrees

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What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from two parents based on their genotypes.

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What does a Pedigree Chart show?

Back

A Pedigree Chart shows how a trait is passed through multiple generations of a family.

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What is a dominant gene?

Back

A dominant gene is a gene that expresses its trait even when only one copy is present.

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What is a recessive gene?

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A recessive gene is a gene that only expresses its trait when two copies are present.

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Can two right-handed parents have a left-handed child?

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Yes, if both parents pass on a recessive left-handed gene.

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What does heterozygous mean?

Back

Heterozygous means having two different alleles for a particular gene.

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What does homozygous mean?

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Homozygous means having two identical alleles for a particular gene.

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What is the purpose of a Punnett Square?

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The purpose of a Punnett Square is to determine the probability of an offspring inheriting a particular trait.

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What is the genotype?

Back

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

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What is the phenotype?

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