Dihybrid Punnett Squares

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What is a Dihybrid Punnett Square?

Back

A Dihybrid Punnett Square is a diagram used to predict the outcome of a genetic cross involving two traits, each represented by two alleles.

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What does the term 'heterozygous' mean?

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Heterozygous refers to having two different alleles for a specific gene, such as Aa.

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What does the term 'homozygous' mean?

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Homozygous refers to having two identical alleles for a specific gene, such as AA or aa.

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What is the phenotypic ratio expected from a dihybrid cross?

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The expected phenotypic ratio from a dihybrid cross is 9:3:3:1.

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What is the genotypic ratio expected from a dihybrid cross?

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The expected genotypic ratio from a dihybrid cross is 1:2:1:2:4:2:1:2:1.

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How do you determine the possible gametes from a genotype?

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To determine possible gametes, combine one allele from each gene. For example, from GgBb, the gametes are GB, Gb, gB, gb.

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What is the significance of dominant and recessive alleles?

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Dominant alleles mask the effect of recessive alleles in the phenotype. For example, in the case of brown (B) and blue (b) eyes, B is dominant.

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What is a phenotype?

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

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What is a genotype?

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A genotype is the genetic constitution of an organism, representing the alleles it carries.

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What is the purpose of a Punnett Square?

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A Punnett Square is used to predict the probability of offspring inheriting particular traits from their parents.