Punnett Square Practice #1-Missing Alleles

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What is a Punnett Square?

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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 are alleles?

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

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What does homozygous mean?

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

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What does heterozygous mean?

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

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What is the genotype?

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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.

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What is a dominant allele?

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

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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., aa).

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How do you determine the possible genotypes from a Punnett Square?

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You list all possible combinations of alleles from the parents' genotypes in the squares of the Punnett Square.

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What is the purpose of using a Punnett Square?

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The purpose of using a Punnett Square is to predict the probability of an offspring inheriting particular traits.