Dihybrid Crosses

Front

What is a Dihybrid Cross?

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A genetic cross that involves two traits, each represented by two alleles.

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What does homozygous mean?

Back

An organism with two identical alleles for a trait.

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What does heterozygous mean?

Back

An organism with two different alleles for a trait.

Front

What is the phenotypic ratio of a typical Dihybrid Cross?

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9:3:3:1.

Front

What is the genotypic ratio of a typical Dihybrid Cross?

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1:2:1:2:4:2:1:2:1.

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What is the definition of alleles?

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Different forms of a gene that can exist at a specific locus.

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What does dominant mean in genetics?

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An allele that expresses its trait even in the presence of a recessive allele.

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What does recessive mean in genetics?

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An allele that only expresses its trait 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.

Front

What fraction of offspring will be homozygous dominant in a Dihybrid Cross?

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1/16.