Indicate the type of inheritance involved in each of the following situations. 
(a) Children who exhibit the trait have at least one parent who also exhibits it. 

Verified step by step guidance

1. Understand the concept of inheritance patterns in genetics, which describe how traits are passed from parents to offspring.
2. Analyze the statement: 'Children who exhibit the trait have at least one parent who also exhibits it.' This suggests that the trait does not skip generations.
3. Recall that in dominant inheritance, an affected individual usually has at least one affected parent because only one copy of the dominant allele is needed to express the trait.
4. Contrast this with recessive inheritance, where children can exhibit the trait even if neither parent shows it, due to carriers.
5. Conclude that the described pattern corresponds to a dominant mode of inheritance, where the trait appears in every generation and affected children have affected parents.

Key Concepts

Types of Inheritance Patterns

Inheritance patterns describe how traits are passed from parents to offspring. Common types include dominant, recessive, autosomal, and sex-linked inheritance. Understanding these patterns helps determine how a trait is transmitted through generations.

Dominant Inheritance

In dominant inheritance, only one copy of a dominant allele is needed for the trait to be expressed. Affected individuals usually have at least one affected parent, as the trait does not skip generations.

Recessive Inheritance

Recessive inheritance requires two copies of a recessive allele for the trait to be expressed. Traits can skip generations, and affected children may have parents who do not show the trait but are carriers.