Correct answer: (2) meiosis

Structure X represents an ovum, the female gamete of humans. Gametes divide by meiosis, which is a two-stage type of cell division in sexually reproducing organisms that results in gametes with half the chromosome number of the original cell.

Incorrect answer:

(1) mitosis

Mitosis is another type of cell division in eukaryotic cells conventionally divided into the growth period and another four stages. These stages maintain the chromosome number by equally allocating replicated chromosomes to each of the daughter cells. Only meiosis occurs in sex cells or gametes, except for plants.

(3) recombination

Genetic recombination occurs during prophase I of meiosis, specifically during the chromosomal crossover of homologous chromosomes

(4) cloning