Mutations – a persistent change in the genotype, changes in the body, under the influence of factors that are inherited. Reasons – a) ingestion of mutagens (factors that cause a mutation: physical, chemical and biological). b) a change in the number of individual homologous chromosomes, or changes in their structure. c) change of genes. d) an increase or decrease in the number of chromosomes. Mutational variability, depending on the scale of the disorder, can manifest itself either immediately in the phenotype (dominant trait), or through a series of generations, meeting at the confluence of gametes with the same latent form (recessive trait). Changes the phenotype and genotype .. The biological value is ambiguous, often has a negative value, up to the lethal outcome. However, there are also positive changes, which subsequently serves as a material of evolution.
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.