Heredity and Punnett Squares

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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 is a genotype?

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A genotype is the genetic makeup of an organism, represented by alleles (e.g., BB, Bb, bb).

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What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype (e.g., blue eyes).

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What is a dominant allele?

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A dominant allele is an allele that expresses its trait even when only one copy is present in the genotype.

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What is a recessive allele?

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A recessive allele is an allele that is masked by the presence of a dominant allele and only expresses its trait when two copies are present.

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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.

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What does heterozygous mean?

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Heterozygous refers to having two different alleles for a specific gene (e.g., Bb).

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What does homozygous mean?

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Homozygous refers to having two identical alleles for a specific gene (e.g., BB or bb).

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What is the probability of getting a blue-eyed baby from two heterozygous parents?

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The probability is 25%.

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What are alleles?

Back

Alleles are different forms of a gene that can exist at a specific locus on a chromosome.