Human beings have________ alleles for ABO blood grouping with _________ phenotypes and________ genotypes.

Options

A. 4,3,6
B. 4,6,3
C. 3,4,6
D. 6,3,4

Answer

To answer the question regarding the ABO blood grouping system in human beings, we need to analyze the components involved: alleles, phenotypes, and genotypes.

### Step-by-Step Solution:

1. **Identify the number of alleles for ABO blood grouping:**
- The ABO blood group system is determined by three alleles:
- **IA** (which produces A antigen)
- **IB** (which produces B antigen)
- **i** (which produces no antigen, leading to blood group O)
- Therefore, the number of alleles is **3**.

2. **Identify the number of phenotypes:**
- The phenotypes for the ABO blood group are:
- Blood group A (phenotype A)
- Blood group B (phenotype B)
- Blood group AB (phenotype AB)
- Blood group O (phenotype O)
- Thus, the number of phenotypes is **4**.

3. **Identify the number of genotypes:**
- The possible genotypes for the ABO blood group are:
- **ii** (O blood group)
- **IAIA** (A blood group)
- **IAi** (A blood group)
- **IBIB** (B blood group)
- **IBi** (B blood group)
- **IAIB** (AB blood group)
- This results in a total of **6** distinct genotypes.

### Final Answer:
Human beings have **3** alleles for ABO blood grouping with **4** phenotypes and **6** genotypes.

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