Which ones are simple sequence repeats (SSRs)

Options

A. Minisatellite sequences
B. Microsatellites
C. Pseudogenes
D. Multiple gene family.

Answer

To determine which options are classified as simple sequence repeats (SSRs), we need to understand the definitions and characteristics of the terms provided in the question. Here’s a step-by-step solution:

### Step 1: Understand Simple Sequence Repeats (SSRs)
Simple Sequence Repeats (SSRs), also known as microsatellites, are short sequences of DNA that consist of repeating units of 1-6 base pairs in length. These repeats can occur in tandem and vary in number among individuals.

### Step 2: Analyze the Given Options
1. **Mini-satellite Sequence**: These are longer repeats (10-100 base pairs) and are not classified as SSRs.
2. **Micro-satellite Sequence**: These are indeed short sequences (1-6 base pairs) that repeat multiple times and are classified as SSRs.
3. **Pseudogenes**: These are non-functional sequences that resemble functional genes but have lost their gene expression ability. They are not SSRs.
4. **Multiple Gene Family**: This refers to a group of related genes that have evolved by duplication and divergence. While they can exhibit some repetitive characteristics, they are not classified as SSRs.

### Step 3: Identify the Correct Answer
From the analysis:
- The only option that fits the definition of simple sequence repeats (SSRs) is **Micro-satellite Sequence**.

### Final Answer
**Micro-satellite Sequence** is the correct answer as it represents simple sequence repeats (SSRs).

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