Punnett Squares

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.

Front

What is a phenotype?

Back

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

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles are expressed in the phenotype even when only one copy is present, while recessive alleles are expressed only when two copies are present.

Front

What is the significance of the yellow box in a Punnett Square?

Back

The yellow box typically represents a specific genotype or phenotype that is being analyzed in the context of the genetic cross.

Front

How do you calculate the percentage of genotypes in a Punnett Square?

Back

To calculate the percentage of genotypes, divide the number of boxes representing a specific genotype by the total number of boxes in the Punnett Square and multiply by 100.

Front

What is the expected genotype ratio from a monohybrid cross?

Back

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

Front

What is the expected phenotype ratio from a monohybrid cross?

Back

The expected phenotype ratio from a monohybrid cross is typically 3:1 (dominant : recessive).