Punnett Squares 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?

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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 the probability of getting a recessive trait in a Punnett Square?

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The probability of getting a recessive trait depends on the genotypes of the parents and can be calculated using the Punnett Square.

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What is the difference between genotype and phenotype?

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Genotype refers to the genetic makeup of an organism (e.g., 'Tt'), while phenotype refers to the observable traits (e.g., brown fur).

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How are dominant alleles represented?

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Dominant alleles are represented by a capital letter (e.g., 'B' for brown fur).

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How are recessive alleles represented?

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Recessive alleles are represented by a lowercase letter (e.g., 'b' for white fur).

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What is the expected phenotype ratio from a monohybrid cross?

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The expected phenotype ratio from a monohybrid cross is typically 3:1 for dominant to recessive traits.

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What does it mean if an organism is homozygous recessive?

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An organism is homozygous recessive if it has two recessive alleles for a trait (e.g., 'bb').

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What is the significance of a capital letter in genetics?

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A capital letter signifies a dominant allele, which will express its trait even if only one copy is present.