Punnett Squares - Monohybrid Crosses

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What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

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What does the term 'genotype' refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

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What does the term 'phenotype' refer to?

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Phenotype refers to the observable characteristics or traits of an organism, which result from the interaction of its genotype with the environment.

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What is the difference between homozygous and heterozygous genotypes?

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Homozygous genotypes have two identical alleles for a trait (e.g., BB or bb), while heterozygous genotypes have two different alleles (e.g., Bb).

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If a dog has a genotype of 'BB', what is its phenotype?

Back

The phenotype would be the trait associated with the dominant allele, which could be, for example, tall fur.

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In a monohybrid cross, what is being studied?

Back

A monohybrid cross studies the inheritance of a single trait controlled by one gene with two alleles.

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What is the expected phenotypic ratio in a monohybrid cross of two heterozygous parents (Tt x Tt)?

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The expected phenotypic ratio is 3:1, where 3 offspring show the dominant trait and 1 shows the recessive trait.

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What does it mean if an organism is homozygous recessive?

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It means the organism has two recessive alleles for a trait (e.g., 'tt'), resulting in the expression of the recessive phenotype.

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What is the purpose of using a Punnett Square in genetics?

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The purpose is to visualize and calculate the probability of different genotypes and phenotypes in offspring from a genetic cross.

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What is an allele?

Back

An allele is a variant form of a gene that can produce different traits.