Punnett Square

Front

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.

Front

What does heterozygous mean?

Back

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

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., AA, Aa, aa).

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype (e.g., black or white fur).

Front

What is the dominant trait?

Back

A dominant trait is an allele that expresses its phenotype even when only one copy is present (e.g., black hair color in mice).

Front

What is the recessive trait?

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A recessive trait is an allele that only expresses its phenotype when two copies are present (e.g., white hair color in mice).

Front

How do you determine the phenotypic ratio from a Punnett Square?

Back

The phenotypic ratio is determined by counting the number of offspring with each phenotype and expressing it in simplest form.

Front

What is the probability of an event?

Back

The probability of an event is the likelihood that the event will occur, expressed as a fraction, percentage, or ratio.

Front

If both parents are Bb, what is the probability of a bb offspring?

Back

The probability of a bb offspring from two Bb parents is 25%.