Monohybrid & Dihybrid Practice

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What is a monohybrid cross?

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A genetic cross between individuals that involves one pair of contrasting traits.

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What is a dihybrid cross?

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A genetic cross between individuals that involves two pairs of contrasting traits.

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What does dominant mean in genetics?

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

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What does recessive mean in genetics?

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A recessive allele is one that expresses its trait only when two copies are present.

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What is a Punnett Square?

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A diagram used to predict the outcome of a genetic cross by showing the possible allele combinations.

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What is the genotype of an organism?

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The genetic makeup or allele combination of an organism.

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What is the phenotype of an organism?

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

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What does homozygous mean?

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An organism that has two identical alleles for a trait (e.g., TT or tt).

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What does heterozygous mean?

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An organism that has two different alleles for a trait (e.g., Tt).

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What is the probability of obtaining a homozygous recessive offspring from a monohybrid cross of two heterozygous parents?

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25%.