Explain salient features of Hugo de Vries theory of mutation. How is Darwin's theory of natural selection different from it ? Explain.

Explanation

### Step-by-Step Solution:

1. **Introduction to Evolutionary Theories**:
- Evolution is the process through which living organisms undergo gradual changes over time. Different scientists have proposed various mechanisms to explain this process, notably Hugo de Vries and Charles Darwin.

2. **Hugo de Vries' Theory of Mutation**:
- Hugo de Vries proposed that mutations are the fundamental basis for evolution. He introduced the concept of "saltation," which refers to sudden, large changes in an organism's genetic makeup.
- According to de Vries, these mutations can occur in a single step and lead to significant changes in the organism, which can then contribute to the evolutionary process.
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