Punnett Squares and Heredity

Front

What is a Punnett Square?

Back

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

Front

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 dominant allele?

Back

A dominant allele is a variant of a gene that will express its trait in the presence of another allele.

Front

What is a recessive allele?

Back

A recessive allele is a variant of a gene that only expresses its trait when two copies are present (homozygous recessive).

Front

What is the genotype for a homozygous dominant trait?

Back

The genotype for a homozygous dominant trait is represented as two uppercase letters, such as AA.

Front

What is the genotype for a homozygous recessive trait?

Back

The genotype for a homozygous recessive trait is represented as two lowercase letters, such as aa.

Front

What is the probability of having a heterozygous offspring from a homozygous recessive and a heterozygous parent?

Back

The probability is 50%.

Front

What are genes?

Back

Genes are segments of DNA that carry the instructions for traits in offspring.

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.