From the moment a child is conceived, its genetic inheritance is defined. The color of his eyes, of his hair, his height, everything, absolutely everything is defined thanks to the chromosomal contribution, those chemical structures that contain the information and instructions necessary for the child to develop.
Within the chromosomes are the genes, these are responsible for the transmission of the hereditary characters that will mark the future child. All cells in the body have 46 chromosomes that in turn are grouped into pairs, unlike sperm and eggs that only contain 23 chromosomes. The union of both forms the 46 chromosomes, is an equitable contribution by the couple, each contributes just half.
The future baby will be unrepeatable, the genetic union provided by ovule and sperm allows the future child to be unique and genuine. Of course, there is always an exception in every rule, it is the case of monozygotic twins, twins that are genetically equal. The two parts have contributed their genetic load, sperm and ovule, now the fight of the genes begins, some dominate others and will impose their genetic load. For example, a dominant blue-eyed gene will be imposed on the other gene that determined that the eyes would be green and so on with all the features of the future baby.
It can also happen that both genes are equally dominant with what will result in an equitable mixture of both parts, in this case the eyes may well turn bluish green.
All these aspects are contemplated in Mendel's laws, but whether it is a dominant gene or not, there is no doubt that the contribution is totally equitable and that the future baby is the fruit of both parents.
