1) Meiosis is the basis for the formation of gametes with a haploid set of chromosomes.
2) The formation of a zygote with a diploid set of chromosomes occurs as a result of fertilization.
3) Cell division by mitosis is the basis of the growth of the daughter organism.
Thus, mitosis, meiosis and fertilization are the basis for maintaining the constancy of the number and form of chromosomes in cells.
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.