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 TT or tt.

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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 Tt.

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What is the genotype?

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

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What is the phenotype?

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The phenotype is the observable physical or biochemical characteristics of an organism, determined 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 only express their trait when two copies are present.

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How many chromosomes do humans have?

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Humans have 46 chromosomes in each normal body cell.

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What is a monohybrid cross?

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A monohybrid cross is a genetic cross between parents that differ in a single trait.

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What is a dihybrid cross?

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A dihybrid cross is a genetic cross between parents that differ in two traits.

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What is the law of segregation?

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The law of segregation states that during the formation of gametes, the two alleles for a trait separate from each other.