Chromosomal diseases are caused by changes in the structure or number of chromosomes. In contrast to gene diseases, the vast majority of chromosomal diseases are characterized not by their inheritance from previous generations, but by emergence as a result of a new mutation. This mutation can occur both in the gametes of one of the parents, and in the zygote or in the early stages of the development of the embryo (embryo).
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.