Monosomic and trisomic conditions are

Options

A. 2n -1, 2n+1
B. 2n-1,2n-2
C. 2n+1,2n+3
D. n,n+1

Answer

To solve the question regarding monosomic and trisomic conditions, we can break it down into the following steps:

### Step 1: Understand Chromosome Number Representation
In genetics, the total number of chromosomes in a normal organism is represented as 2n, where n is the number of pairs of chromosomes.

**Hint:** Remember that "n" represents the haploid number of chromosomes, while "2n" represents the diploid number.

### Step 2: Define Monosomy
Monosomy occurs when there is a loss of one chromosome from a pair. This means that instead of having two copies of a chromosome (one from each parent), there is only one.

**Hint:** Think of monosomy as "missing one" chromosome from a pair.

### Step 3: Mathematical Representation of Monosomy
Since monosomy means one chromosome is missing from the normal diploid number, it can be represented mathematically as 2n - 1.

**Hint:** The formula for monosomy subtracts one from the total diploid count.

### Step 4: Define Trisomy
Trisomy occurs when there is an extra chromosome in addition to the normal pair. This means there are three copies of a particular chromosome instead of the usual two.

**Hint:** Consider trisomy as "having one extra" chromosome in a pair.

### Step 5: Mathematical Representation of Trisomy
For trisomy, since there is one additional chromosome, it can be represented as 2n + 1.

**Hint:** The formula for trisomy adds one to the total diploid count.

### Step 6: Identify the Correct Options
From the options given in the question:
- Monosomy is represented as 2n - 1.
- Trisomy is represented as 2n + 1.

However, the question seems to have a typographical error in the options provided. The correct representation for monosomy is 2n - 1 and for trisomy is 2n + 1.

### Conclusion
The correct answer for the representation of monosomic and trisomic conditions is:
- Monosomic condition: 2n - 1
- Trisomic condition: 2n + 1

**Final Answer:** The correct answer is option 1 (2n - 1 for monosomy and 2n + 1 for trisomy).

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