Punnett Squares

Front

What is a dominant allele?

Back

A dominant allele is a variant of a gene that always shows up in an organism when it is present.

Front

What is a recessive allele?

Back

A recessive allele is a variant of a gene that only shows up in an organism if two copies are present.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as 'PP' or 'tt'.

Front

What does heterozygous mean?

Back

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

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from two parents.

Front

What does genotype mean?

Back

Genotype refers to the genetic constitution of an individual, represented by the alleles they possess.

Front

What does phenotype mean?

Back

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

Front

What is the probability of obtaining a homozygous dominant offspring from two heterozygous parents?

Back

The probability is 25%.

Front

What is codominance?

Back

Codominance is a genetic scenario where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.

Front

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

Back

Count the number of boxes representing that genotype and divide by the total number of boxes.