Lesson Check: Inheritance

Front

What is a heterozygous organism?

Back

An organism that has two different alleles for a trait.

Front

What is a homozygous organism?

Back

An organism that has two identical alleles for a trait.

Front

What does the term 'dominant allele' mean?

Back

An allele that expresses its trait even when paired with a different allele.

Front

What does the term 'recessive allele' mean?

Back

An allele that only expresses its trait when paired with another recessive allele.

Front

What is a phenotype?

Back

The physical traits or characteristics of an organism.

Front

What is a genotype?

Back

The genetic makeup of an organism, represented by alleles.

Front

What is the purpose of a Punnett square?

Back

To predict the possible genotypes and phenotypes of offspring from a genetic cross.

Front

What is incomplete dominance?

Back

A genetic situation where one allele does not completely dominate another, resulting in a blend of traits.

Front

What is codominance?

Back

A genetic situation where both alleles in a heterozygous organism are fully expressed.

Front

What is the expected ratio of offspring from a heterozygous x homozygous cross if one allele is dominant?

Back

The expected ratio is 1 dominant: 1 recessive.