During reproduction, the chromosome number (2n) reduces to half (n) in the gametes, and again the original number (2n) is restored in the offspring, what are the processes through which these events take place?
Chromosome number reduces to half in gametes as, during gametogenesis, meiosis takes place resulting in the haploid number of chromosomes.
During Fertilisation, male and female gametes undergo fusion to make the diploid zygote.