Genotype and Alleles:
- Genotype refers to the genetic makeup of an individual, which is composed of alleles.
- Alleles are alternative forms of a gene that can occupy the same position (locus) on a chromosome.

Given Information:
- The human male produces sperms with the genotypes AB, Ab, aB, and ab pertaining to two diallelic characters in equal proportions.
- This means that each genotype is produced with a frequency of 1/4 or 25%.

Understanding Diallelic Characters:
- Diallelic characters are traits controlled by two alleles at a single gene locus.
- Each allele can have two forms, usually represented by uppercase and lowercase letters.

Determining the Corresponding Genotype:
- We are given the genotypes AB, Ab, aB, and ab in equal proportions.
- We need to determine the corresponding genotype of this person.

Analysis:
- Let's analyze the frequencies of the alleles at each locus separately.

For the first locus:
- From the given genotypes, we can see that the two possible alleles are A and a.
- The genotypes AB and Ab both have the A allele, while the genotypes aB and ab have the a allele.
- Since each genotype is produced with a frequency of 1/4, the frequency of the A allele is 1/4 + 1/4 = 1/2, and the frequency of the a allele is also 1/2.

For the second locus:
- From the given genotypes, we can see that the two possible alleles are B and b.
- The genotypes AB and aB both have the B allele, while the genotypes Ab and ab have the b allele.
- Similarly, the frequency of the B allele is 1/4 + 1/4 = 1/2, and the frequency of the b allele is also 1/2.

Combining the Alleles:
- The corresponding genotype can be determined by combining the alleles at each locus.
- Since the frequencies of the alleles are equal, the corresponding genotype will be heterozygous at both loci (AaBb).

Therefore, the corresponding genotype of this person is AaBb, which is option (d).