If two diploid cells (2n) joined together in sexual reproduction, their fusion would produce a tetraploid zygote (4n). How do cells that fuse together in sexual reproduction ensure the production of a diploid zygote instead of a tetraploid zygote?


A. The chromosomes fuse, which produces cells with half the number of chromosomes.
B. They first undergo meiosis, so these cells have only half the number of chromosomes.
C. The zygote splits in half, which produces two cells, each with half the number of chromosomes.
D. After fertilization, the cell undergoes meiosis, which reduces the number of chromosomes by half.