Punnett Square Review

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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 does homozygous mean?

Back

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

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What does heterozygous mean?

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

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What is a dominant allele?

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A dominant allele is an allele whose trait always shows up in the organism when the allele is present.

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What is a recessive allele?

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A recessive allele is an allele that only shows its trait if the organism has two copies of that allele (homozygous recessive).

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What is a phenotype?

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A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

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What is a genotype?

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A genotype is the genetic constitution of an individual, represented by the alleles they possess, such as TT, Tt, or tt.

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What is the difference between phenotype and genotype?

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

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What does it mean for an organism to be purebred?

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A purebred organism has a homozygous genotype, meaning it has two identical alleles for a trait.

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What is the purpose of a Punnett Square?

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