This is because they are changed during the reduction division by a process called crossing-over.

For that reason, meiosis is often called reduction division.

Hertwig, Weismann, and the meaning of the reduction division, circa 1890.

The mature sporophyte produces spores by meiosis, sometimes referred to as "reduction division" because the chromosome pairs are separated once again to form single sets.

Individual plants have two identical sets of genes (2n) in every cell except the gametes, which through reduction division have only one set of genes (in).

Diplospory, a type of Agamospermy, occurs during the development of female gametophyte in the ovule and hence reduction division does not take place in the Megaspore mother cell.

But the cells usually died when they underwent the reduction division (meiosis) necessary to produce gametes with half the parental chromosomes, so that the older the fetus the fewer the germ cells found.

William Nicol, who heads the poverty reduction division of the Development Assistance Committee at the Organization for Economic Cooperation and Development, a group of economically advanced countries, scoffed at Usaid's interpretation.

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Only rarely does the first reduction division in meiosis in the plants' flowers tidily fail completely resulting in a euploid triploid ovule, which can be fertilized by normal haploid pollen from a diploid banana variety; a whole stem of bananas would contain only a few seeds and sometimes none.