A polyploid species having multiple and identical sets of chromosomes is called

Options

A. allopolypoid
B. amphidiploid
C. anuploid
D. autopolypoid

Answer

To solve the question "A polyploid species having multiple and identical sets of chromosomes is called", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Polyploidy**:
- Polyploidy refers to a condition in which an organism has more than two complete sets of chromosomes. This is a common phenomenon in many plants and some animal species, including certain fish.

**Hint**: Remember that polyploidy involves multiple sets of chromosomes beyond the diploid (2n) state.

2. **Identify the Types of Polyploidy**:
- There are different types of polyploidy:
- **Autopolyploid**: This is when an organism has multiple sets of chromosomes that are all derived from a single species.
- **Allopolyploid**: This involves multiple sets of chromosomes derived from different species.
- **Amphidiploid**: This is a specific type of allopolyploid where the organism has two sets of chromosomes from two different species, and both sets are diploid.
- **Uniploid**: This refers to organisms with only one set of chromosomes, which does not fit the definition of polyploidy.

**Hint**: Differentiate between the terms by focusing on the origin of the chromosome sets (same species vs. different species).

3. **Analyze the Options**:
- **Option A: Allopolyploid**: This refers to polyploids formed from the hybridization of two different species.
- **Option B: Amphidiploid**: This is a type of allopolyploid that has two complete diploid sets from two different species.
- **Option C: Uniploid**: This does not apply as it refers to a single set of chromosomes.
- **Option D: Autopolyploid**: This refers to multiple sets of chromosomes from the same species.

**Hint**: Focus on the requirement of "multiple and identical sets" to narrow down the options.

4. **Select the Correct Answer**:
- Given the question specifies "multiple and identical sets of chromosomes", the correct answer is **Option D: Autopolyploid**. This is because an autopolyploid has multiple sets of chromosomes that are identical, all derived from the same species.

**Hint**: Remember that "identical sets" indicates that the chromosome sets come from the same species, which is characteristic of autopolyploids.

### Final Answer:
The correct answer is **Option D: Autopolyploid**.