1) Family marriages are common in small communities.
2) Family marriages lead to an increase in the homozygosity of people for a number of reasons.
3) The transition of recessive mutations to a homozygous state leads to various diseases that, as a rule, do not appear in a heterozygous state in populations where related marriages are not accepted.
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.