ABO blood grouping is determined by three alleles. Possble genotypes and phenotypes are

Options

A. 3,1
B. 6,4
C. 4,6
D. 9,7

Answer

To determine the possible genotypes and phenotypes for ABO blood grouping, we need to understand the alleles involved and how they interact. Here’s a step-by-step solution:

### Step 1: Identify the Alleles
The ABO blood group is determined by three alleles:
- **IA** (A allele)
- **IB** (B allele)
- **IO** (O allele)

### Step 2: Determine Dominance Relationships
- **IA** and **IB** are both dominant alleles.
- **IO** is a recessive allele.

### Step 3: List the Possible Blood Group Phenotypes
The phenotypes (observable traits) for ABO blood grouping are:
1. Blood group A
2. Blood group B
3. Blood group AB
4. Blood group O

### Step 4: Determine Possible Genotypes for Each Phenotype
Now, we will identify the genotypes corresponding to each phenotype:
- **Blood group A** can have the following genotypes:
- IAIA (homozygous)
- IAIO (heterozygous)

- **Blood group B** can have the following genotypes:
- IBIB (homozygous)
- IBIO (heterozygous)

- **Blood group AB** has only one genotype:
- IAIB (heterozygous)

- **Blood group O** has only one genotype:
- IOIO (homozygous)

### Step 5: Count the Total Genotypes
Now, we can summarize the possible genotypes:
1. IAIA (A)
2. IAIO (A)
3. IBIB (B)
4. IBIO (B)
5. IAIB (AB)
6. IOIO (O)

Thus, the total number of possible genotypes is **6**.

### Step 6: Summarize the Findings
- **Total Phenotypes**: 4 (A, B, AB, O)
- **Total Genotypes**: 6 (IAIA, IAIO, IBIB, IBIO, IAIB, IOIO)

### Final Answer
The possible genotypes for ABO blood grouping are **6**, and the possible phenotypes are **4**.

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