Occasionally in the cell divisions that occur during the formation of eggs and sperm, an unequal exchange of parts of chromosomes leads to production of a gamete that possesses a chromosome containing extra copies of one or more genes.
Occasionally in the cell divisions that occur during the formation of eggs and sperm, an unequal exchange of parts of chromosomes leads to production of a gamete that possesses a chromosome containing extra copies of one or more genes.
卵子与精子形成的过程中，偶尔会在细胞分裂时出现部份染色体互换不对等的状况，使得某个配子的染色体多出一个或数个基因。