As for the genes of offspring, simply speaking, half of them come from both parents, half from your eggs and half from your father's sperm. If your ex-boyfriend didn't have a procreation with you, your offspring won't have your ex-boyfriend's genes.

A child develops from a fertilized egg. A fertilized egg is a cell formed by combining a female egg with a male sperm. There is no relationship between an egg and several sperm, because the egg and sperm refuse to combine with other sperm after interaction, so if the child is a woman and a man now, there will be no gene of the first man. This has nothing to do with whether it is injective or not.

Gene is the chemical carrier of human genetic information, which determines the similarities and differences between us and our predecessors. When genes "work" normally, our bodies can develop and function normally. If a gene is abnormal, even a very small fragment of the gene is abnormal, it may lead to abnormal development, disease and even death.