Hi! I canât say I know what your problem is but I did read that the clumps in the sperm may be nothing harmful and are not necessarily a sign of an underlying disease. They can however, be painful sometimes and their cause might not always be found.
In addition to differences between genes, the arrangement of nucleic acids can differ between copies of the same gene. This results in different forms of individual genes. Different forms of a gene are called alleles. Organisms that reproduce sexually receive one complete copy of their genetic material from each parent.
For example, a gene that makes the brown pigment in your eyes might come in a regular (brown) version and a mutant (blue) version. Because you have two copies of your DNA (one from Mom and one from Dad), you might end up with two different alleles of the same gene. In that case, we would say you are heterozygous. The opposite of that is homozygous, two identical alleles.