Dihybrid Crosses

Front

What is a Dihybrid Cross?

Back

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

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What are genotypes?

Back

The genetic makeup of an organism, represented by the alleles it possesses.

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What does heterozygous mean?

Back

An organism with two different alleles for a specific trait (e.g., Bb).

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What does homozygous mean?

Back

An organism with two identical alleles for a specific trait (e.g., BB or bb).

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What is the phenotypic ratio of a typical dihybrid cross?

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9:3:3:1, representing the different combinations of traits.

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What is the purpose of a Punnett square?

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To predict the possible genotypes and phenotypes of offspring from a genetic cross.

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What is the difference between dominant and recessive alleles?

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Dominant alleles mask the effect of recessive alleles in heterozygous conditions.

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What is the probability of obtaining a tall offspring from a cross of TT and Tt?

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100% chance of tall offspring.

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What is co-dominance?

Back

A genetic scenario where both alleles in a heterozygote are fully expressed (e.g., AB blood type).

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What is incomplete dominance?

Back

A genetic scenario where the phenotype of heterozygotes is intermediate between the two homozygotes (e.g., red and white flowers producing pink flowers).