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 codominance mean?

Back

Codominance is a genetic condition where both alleles for a gene are fully expressed, resulting in offspring with a phenotype that shows both traits.

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What is incomplete dominance?

Back

Incomplete dominance is a genetic situation where one allele does not completely dominate another, resulting in a blended phenotype.

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What does the letter 'B' represent in genetics?

Back

In genetics, 'B' often represents a dominant allele, such as brown fur.

Front

What does the letter 'b' represent in genetics?

Back

In genetics, 'b' often represents a recessive allele, such as white fur.

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How do you calculate the probability of a trait using a Punnett Square?

Back

To calculate the probability of a trait, count the number of times the desired phenotype appears in the Punnett Square and divide by the total number of outcomes.

Front

What is the genotype for brown fur if 'B' is brown and 'b' is white?

Back

The genotype for brown fur can be either BB (homozygous dominant) or Bb (heterozygous).

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What is the probability of getting white fur from a Bb x Bb cross?

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The probability of getting white fur (bb) from a Bb x Bb cross is 25%.

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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.

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What does the term 'phenotype' refer to?

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Phenotype refers to the observable traits or characteristics of an organism, determined by its genotype.