Definition of Saltation:
Saltation is a term used in genetics to describe a single-step large mutation. It is different from the gradual accumulation of small mutations over time.

Explanation:
- Saltation involves a sudden and significant change in the genetic material, leading to a new trait or characteristic in an organism.
- This type of mutation is rare but can have a profound impact on the evolution of a species.
- Saltation is often associated with large-scale changes such as the development of new structures or functions.

Examples of Saltation:
- One famous example of saltation is the development of the wings in insects. This sudden mutation allowed insects to fly and greatly increased their chances of survival and reproduction.
- Another example is the evolution of the mammalian placenta, which is believed to have occurred through a saltational event in early mammalian history.

Significance of Saltation:
- Saltation plays a crucial role in driving evolutionary change and creating genetic diversity within a population.
- It can lead to the emergence of new species or the development of novel adaptations that help organisms thrive in their environments.

In conclusion, saltation is a term used to describe a single-step large mutation that can have significant consequences for the evolution of a species. It represents a sudden and dramatic change in the genetic material, leading to the development of new traits or characteristics in an organism.