2023~Punnett Square Practice

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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 mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as AA or aa.

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What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Aa.

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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., 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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What is the genotype?

Back

The genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., AA, Aa, or aa).

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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 the probability of offspring?

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The probability of offspring refers to the likelihood of a specific trait being passed on to the next generation, often expressed as a percentage.

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How do you calculate the probability of a trait using a Punnett Square?

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To calculate the probability, fill in the Punnett Square with the alleles from each parent and count the occurrences of each genotype.

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What is the expected outcome of a cross between a homozygous dominant and a homozygous recessive organism?

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The expected outcome is that all offspring will be heterozygous and express the dominant trait.