Punnett Squares Practice

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from a particular cross between two organisms.

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What do the letters in a Punnett Square represent?

Back

The letters represent alleles, which are different forms of a gene. Uppercase letters indicate dominant alleles, while lowercase letters indicate recessive alleles.

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What is a genotype?

Back

A genotype is the genetic constitution of an individual, represented by the alleles they possess (e.g., BB, Bb, bb).

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What is a phenotype?

Back

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

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What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., BB or bb).

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What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Bb).

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What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present in the genotype.

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What is a recessive allele?

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A recessive allele is an allele that only expresses its trait when two copies are present in the genotype.

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How do you calculate the probability of a specific genotype in offspring?

Back

You can calculate the probability by analyzing the Punnett Square and counting the occurrences of the desired genotype.

Front

What is the expected genotype ratio from a monohybrid cross?

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The expected genotype ratio from a monohybrid cross is typically 1:2:1 (homozygous dominant : heterozygous : homozygous recessive).