Find the incorrect match with respect to linkage group

Options

A. Neuropora - 2
B. Zea mays - 10
C. Pisum sativum - 7
D. Drosophila -4

Answer

To find the incorrect match with respect to linkage groups, we need to analyze the given options based on the number of chromosomes in various organisms. Here’s a step-by-step solution:

### Step 1: Understand Linkage Groups
Linkage groups refer to the set of genes that are located on the same chromosome and tend to be inherited together. Each organism has a specific number of chromosomes that can be classified as haploid (N) or diploid (2N).

### Step 2: Identify the Organisms and Their Chromosome Counts
We need to look at the organisms mentioned in the problem and their respective chromosome counts:
- **Drosophila (fruit fly)**: 2N = 8 (2 sex chromosomes and 6 autosomes)
- **Pisum sativum (garden pea)**: 2N = 14 (7 pairs of chromosomes)
- **Zea mays (maize)**: 2N = 20 (10 pairs of chromosomes)
- **Neurospora (fungus)**: This is a haploid organism, which means it has only N chromosomes.

### Step 3: Analyze Neurospora's Chromosome Count
Neurospora is a haploid organism, meaning it has a single set of chromosomes. If it has 7 distinct chromosomes, then its haploid number (N) is 7. Therefore, it cannot have a diploid number (2N) of 14.

### Step 4: Identify the Incorrect Match
Based on the analysis:
- If Neurospora is stated to have 2N = 14, this is incorrect because it is a haploid organism and should only have N = 7.

### Conclusion
The incorrect match with respect to linkage group is **Neurospora**, which is incorrectly represented as having 2N = 14. The correct representation should be N = 7.

### Final Answer
**Neurospora is the incorrect match.**

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