What are chromosomal diseases? What is their difference from gene diseases?

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).

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