A species has 2n =16 chromosomes .How many chromosomes will be found per cell in each of the following nutanats

Options

A. Monosomic and nullisomic conditions
B. Autotriploid
C. Trisomic
D. Double monosomic

Answer

To solve the question regarding the number of chromosomes found per cell in various mutants of a species with a diploid number of chromosomes (2n = 16), we can follow these steps:

### Step 1: Understand the Diploid Number
The diploid number (2n) indicates that there are 16 chromosomes in total when the organism is in its somatic (non-reproductive) cells. This means that in a normal diploid cell, there are 8 pairs of homologous chromosomes.

**Hint:** Remember that "n" represents the number of distinct chromosomes, while "2n" represents the total number of chromosomes in a diploid organism.

### Step 2: Determine the Chromosome Number in Different Mutant Conditions
1. **Monosomic Condition:** In a monosomic condition, one chromosome from a pair is missing. Therefore, the chromosome count will be:
- Total chromosomes = 2n - 1 = 16 - 1 = 15 chromosomes.

2. **Nullisomic Condition:** In a nullisomic condition, both chromosomes from a pair are missing. Therefore, the chromosome count will be:
- Total chromosomes = 2n - 2 = 16 - 2 = 14 chromosomes.

3. **Trisomic Condition:** In a trisomic condition, there is an extra chromosome in one of the pairs. Therefore, the chromosome count will be:
- Total chromosomes = 2n + 1 = 16 + 1 = 17 chromosomes.

4. **Double Monosomic Condition:** In a double monosomic condition, one chromosome from each of two pairs is missing. Therefore, the chromosome count will be:
- Total chromosomes = 2n - 2 = 16 - 2 = 14 chromosomes.

5. **Autotriploid Condition:** In an autotriploid condition, there are three copies of each chromosome instead of the usual two. Therefore, the chromosome count will be:
- Total chromosomes = 3n = 3 * 8 = 24 chromosomes.

### Summary of Chromosome Counts:
- **Monosomic:** 15 chromosomes
- **Nullisomic:** 14 chromosomes
- **Trisomic:** 17 chromosomes
- **Double Monosomic:** 14 chromosomes
- **Autotriploid:** 24 chromosomes

### Final Answer:
The number of chromosomes per cell in the specified mutant conditions are:
- Monosomic: 15
- Nullisomic: 14
- Trisomic: 17
- Double Monosomic: 14
- Autotriploid: 24