Some genes are passed through , in which some genes are always expressed, regardless of the gene they are paired with other. Others will only be expressed if paired with another recessive gene.

Dominant -recessive inheritance

Explanation:

Some of the genes are passed through the dominant-recessive inheritance. The gene that are expressed and cause disease are known as dominant genes regardless they are paired or not.

In case of normal inheritance the genes are expressed only when paired. Else they will not be passed from one generation to another.

In case of the dominant recessive inheritance the disease causing gene is transferred from one generation to another with or without pair.

Dominant -recessive inheritance.

Explanation:

Mendel is considered the father of genetics. He explained the law of segregation and the law of independent assortment to explain the inheritance pattern.

The concept of dominance states that the dominant trait can express itself in the homozygous as well as in the heterozygous condition. The recessive trait can only be expressed in the homozygus recessive condition only. This is also known as the  dominant -recessive inheritance.

Thus, the answer is dominant -recessive inheritance.