heredity

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What is heredity?

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Heredity is the passing of traits from parents to offspring through genes.

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What does it mean if a trait is dominant?

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A dominant trait is one that will appear in the offspring if at least one parent contributes it.

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What does it mean if a trait is recessive?

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A recessive trait will only appear in the offspring if both parents contribute it.

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What is a genotype?

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A genotype is the genetic makeup of an organism, represented by letters (e.g., RR, Rr, rr).

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What is a phenotype?

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A phenotype is the observable physical characteristics of an organism, determined by its genotype.

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What is a homozygous genotype?

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A homozygous genotype has two identical alleles for a trait (e.g., RR or rr).

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What is a heterozygous genotype?

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A heterozygous genotype has two different alleles for a trait (e.g., Rr).

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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.

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What does it mean for traits to be codominant?

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Codominant traits are both expressed equally in the phenotype of the offspring (e.g., AB blood type).

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What is a pedigree chart?

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A pedigree chart is a diagram that shows the occurrence of a genetic trait across generations.