Genetics- Punnett Squares

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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 homozygous mean?

Back

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

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What does heterozygous mean?

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

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What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

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What is a phenotype?

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A phenotype is the physical expression or characteristics of a trait in an organism, influenced by its genotype.

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What is the difference between dominant and recessive alleles?

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Dominant alleles express their trait even when only one copy is present, while recessive alleles require two copies to express their trait.

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What is the purpose of a test cross?

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A test cross is used to determine the genotype of an organism with a dominant phenotype by crossing it with a homozygous recessive individual.

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What is the expected phenotypic ratio in a monohybrid cross?

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The expected phenotypic ratio in a monohybrid cross is typically 3:1 for dominant to recessive traits.

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What is the expected genotypic ratio in a monohybrid cross?

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The expected genotypic ratio in a monohybrid cross is typically 1:2:1 for homozygous dominant, heterozygous, and homozygous recessive.

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What is an allele?

Back

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