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?

AThe chromosomes fuse, which produces cells with half the number of chromosomes.

BThey first undergo meiosis, so these cells have only half the number of chromosomes.

CThe zygote splits in half, which produces two cells, each with half the number of chromosomes.

DAfter fertilization, the cell undergoes meiosis, which reduces the number of chromosomes by half.