A human male produces sperms with the genotypes AB, Ab, aB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

Options

A. AaBB
B. AABb
C. AABB
D. AaBb

Answer

To determine the corresponding genotype of a human male who produces sperm with the genotypes AB, Ab, aB, and ab, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Gametes**: The question states that the male produces four types of gametes: AB, Ab, aB, and ab. These gametes are formed from two different characters, each represented by two alleles (A/a and B/b).

2. **Understand the Dihybrid Cross**: Since there are two characters, we are dealing with a dihybrid cross. In a dihybrid cross, each character can have a dominant and a recessive allele. Here, A and B are dominant alleles, while a and b are recessive alleles.

3. **Determine the Genotype of the Male**:
- The presence of gametes AB and ab indicates that the male must have one dominant and one recessive allele for each character.
- The gametes AB and Ab suggest that he has at least one dominant A allele and one recessive a allele.
- The gametes aB and ab suggest that he has at least one dominant B allele and one recessive b allele.

4. **Construct the Genotype**:
- Since he can produce all four combinations of gametes (AB, Ab, aB, ab) in equal proportions, the male must be heterozygous for both traits.
- Therefore, the genotype of the male must be AaBb, where:
- A/a represents the alleles for the first character (A is dominant, a is recessive).
- B/b represents the alleles for the second character (B is dominant, b is recessive).

5. **Conclusion**: The corresponding genotype of the person is AaBb.