Genetics and Punnett Squares

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., BB or bb).

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What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Bb).

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What is a phenotype?

Back

The physical trait or characteristic of an organism, such as eye color.

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What is a genotype?

Back

The genetic makeup of an organism, represented by the alleles (e.g., BB, Bb, or bb).

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What is a dominant allele?

Back

An allele that expresses its trait even when paired with a different allele (e.g., B in Bb).

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What is a recessive allele?

Back

An allele that only expresses its trait when paired with another recessive allele (e.g., bb).

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What does it mean if an organism is homozygous dominant?

Back

It has two dominant alleles for a trait (e.g., BB).

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What does it mean if an organism is homozygous recessive?

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It has two recessive alleles for a trait (e.g., bb).

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What does it mean if an organism is heterozygous?

Back

It has one dominant and one recessive allele for a trait (e.g., Bb).

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What is a Punnett square?

Back

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