Which of the following cannot be considered as a feature of mutation?

Options

A. Are random and directioniess
B. Can be small and large
C. Can cause evolution suddenly
D. Can bring change only when they accumulation over period of time

Answer

To determine which of the following options cannot be considered a feature of mutation, let's analyze each statement one by one:

1. **Random and Directionless**:
- Mutations occur randomly and do not follow a specific direction. They can happen at any time and in any organism without a predetermined pattern. This statement is true and is indeed a feature of mutation.

2. **Can be Small and Large**:
- Mutations can vary in size. Some mutations may involve a single nucleotide change (small), while others can involve large segments of DNA, such as duplications or deletions of entire genes or regions (large). This statement is also true and is a feature of mutation.

3. **Can Cause Evolution Suddenly**:
- Mutations can lead to new variations that may result in evolutionary changes. These changes can occur suddenly, especially if they confer a significant advantage or disadvantage in a given environment. This statement is true and is a feature of mutation.

4. **Can Bring Change Only When They Accumulate Over a Period of Time**:
- This statement is misleading. While some mutations may accumulate over time to bring about significant changes, mutations can also cause immediate changes in phenotype or genotype without the need for accumulation. For example, a single mutation can lead to a disease or a new trait appearing in an organism. Thus, this statement is not a feature of mutation.

Based on the analysis, the answer is:
**D. Can bring change only when they accumulate over a period of time.**

This statement cannot be considered a feature of mutation.