In a multiple allele system, a gamete to have

Options

A. (a) several alleles
B. (b) three alleles
C. (c) one allele
D. (d) two alleles

Explanation

### Step-by-Step Text Solution:

1. **Understanding Alleles**:
- An allele is a variant form of a gene that is located at the same locus on a chromosome. Each gene can have multiple alleles, but for a functional gene, at least two alleles are required.

2. **Diploid and Haploid Cells**:
- In humans and many other organisms, somatic cells are diploid, meaning they contain two sets of chromosomes (and therefore two alleles for each gene).

3. **Multiple Allele Systems**:
- In a multiple allele system, such as the ABO blood group system in humans, there are three alleles (I^A, I^B, and i) that determine blood type. However, each individual can only have two of these alleles at a time, one inherited from each parent.

4. **Gametes**:
- Gametes are the reproductive cells (sperm and eggs) and are haploid in nature, meaning they contain only one set of chromosomes. Therefore, each gamete carries only one allele for each gene.

5. **Conclusion**:
- Since gametes are haploid and contain only one allele, the correct answer to the question "In a multiple allele system, a gamete has..." is **one allele**.

### Final Answer:
C) one allele