If the cell of an organism heterozygous for two pairs of genes represented by AaBb , undergoes meiosis , then the possible genotypic combination of gametes will be

Options

A. AB, Ab, aB, ab
B. AB, ab
C. Aa, Bb
D. A, a, B, b

Answer

To determine the possible genotypic combinations of gametes produced by an organism that is heterozygous for two pairs of genes (AaBb), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Genotype**: The organism has the genotype AaBb, meaning it has two alleles for gene A (A and a) and two alleles for gene B (B and b).

2. **Identify Alleles**: For gene A, the alleles are A (dominant) and a (recessive). For gene B, the alleles are B (dominant) and b (recessive).

3. **Apply Mendel’s Law of Segregation**: According to Mendel's law, during gamete formation, the alleles for each gene segregate independently. This means that each gamete will receive one allele from each gene.

4. **Determine Possible Gametes**:
- For gene A, the possible alleles are A or a.
- For gene B, the possible alleles are B or b.
- Therefore, we can combine these alleles to form different gametes.

5. **List All Combinations**:
- Combine the alleles from gene A and gene B:
- Gamete 1: AB (A from A and B from B)
- Gamete 2: Ab (A from A and b from B)
- Gamete 3: aB (a from A and B from B)
- Gamete 4: ab (a from A and b from B)

6. **Count the Gametes**: We have identified four distinct gametes: AB, Ab, aB, and ab.

### Final Answer:
The possible genotypic combinations of gametes from an organism heterozygous for two pairs of genes (AaBb) are:
- AB
- Ab
- aB
- ab