what is 'saltation' according to de Vries ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Saltation**: The term 'saltation' is derived from the Latin word meaning 'leap'. It signifies a sudden change or leap in biological terms.

2. **De Vries' Concept**: According to Hugo de Vries, saltation refers to a type of mutation characterized by a single step large mutation. This means that rather than gradual changes, saltation involves a significant mutation that occurs abruptly.

3. **Implication of Saltation**: This large mutation arises suddenly within a population, leading to substantial changes from one generation to the next. It indicates that the genetic variation introduced is considerable.

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