How many of the following statements are true in the context of the salient features human genome project ?
I. There are 1.4 million SNPs.
II. 99.9% genome is similar in all humans.
III. 32% of genome codes for proteins.
IV.The learget human gene is dystrophin with 2.4 million base pairs.
V. The human genome has a maximum number of genes on `1^(st)` chromosome i.e.,

Options

A. 1
B. 2
C. 3
D. 4

Answer

To determine how many statements are true regarding the salient features of the Human Genome Project, we will analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I:** There are 1.4 million SNPs.
- This statement is **true**. Scientists have identified approximately 1.4 million single nucleotide polymorphisms (SNPs) in the human genome.

### Step 2: Analyze Statement II
**Statement II:** 99.9% of the genome is similar in all humans.
- This statement is **true**. It is estimated that about 99.9% of the base pairs in the human genome are identical across all humans.

### Step 3: Analyze Statement III
**Statement III:** 32% of the genome codes for proteins.
- This statement is **false**. In reality, only about 1% of the human genome codes for proteins, not 32%.

### Step 4: Analyze Statement IV
**Statement IV:** The largest human gene is dystrophin with 2.4 million base pairs.
- This statement is **true**. The dystrophin gene is indeed the largest known human gene, consisting of approximately 2.4 million base pairs.

### Step 5: Analyze Statement V
**Statement V:** The human genome has a maximum number of genes on the 1st chromosome.
- This statement is **false**. While the first chromosome does contain a significant number of genes, it does not have the maximum number of genes compared to other chromosomes.

### Conclusion
Now, we will summarize the truthfulness of each statement:
- Statement I: True
- Statement II: True
- Statement III: False
- Statement IV: True
- Statement V: False

**Total True Statements:** 3 (I, II, IV)

### Final Answer
**The number of true statements is 3.**

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