Which will not the genotype of pollen grain of a plant with genotype HHbbDdnnMMaa :-

Options

A. HbdNMa
B. HbDnMa
C. HbdnMa
D. All the above

Answer

To solve the question of which genotype will not be found in the pollen grain of a plant with the genotype HHbbDdnnMMaa, we can follow these steps:

### Step 1: Understand the Genotype
The genotype of the plant is given as HHbbDdnnMMaa. This means:
- H: Homozygous dominant (HH)
- b: Homozygous recessive (bb)
- D: Heterozygous (Dd)
- n: Homozygous recessive (nn)
- M: Homozygous dominant (MM)
- a: Homozygous recessive (aa)

### Step 2: Identify Gametes from the Genotype
Pollen grains are formed from the male gametes, which are produced through meiosis. Each gamete will receive one allele from each gene. Therefore, we need to determine the possible combinations of alleles that can be produced from the given genotype.

### Step 3: Determine Possible Alleles
1. For H: The only allele is H (since it is homozygous).
2. For b: The only allele is b (since it is homozygous).
3. For D: The possible alleles are D or d (since it is heterozygous).
4. For n: The only allele is n (since it is homozygous).
5. For M: The only allele is M (since it is homozygous).
6. For a: The only allele is a (since it is homozygous).

### Step 4: Combine the Alleles
The possible combinations of alleles for the pollen grain can be:
- H (from HH)
- b (from bb)
- D or d (from Dd)
- n (from nn)
- M (from MM)
- a (from aa)

Thus, the possible genotypes for the pollen grain are:
1. H b D n M a
2. H b d n M a

### Step 5: Analyze the Options
Now we need to check the options provided in the question to identify which one cannot be a genotype of the pollen grain.

Assuming the options are:
- A: H B d n M a
- B: H b D n M a
- C: H b d n M a
- D: H b D n M A

### Step 6: Identify the Incorrect Genotype
- Option A contains a capital B, which is not present in the original genotype (the plant has only small b).
- Option B is valid as it matches one of the combinations.
- Option C is also valid as it matches another combination.
- Option D contains a capital A, which is not present in the original genotype (the plant has only small a).

### Conclusion
The genotype that will **not** be found in the pollen grain is **Option A** (H B d n M a) because it contains a capital B.