Question

Name the organism which undergoes this cycle.

Answer 1

 organisms have meiosis in their life cycle. Normally, diploid organisms only undergoes meiosis. But in some haploid organisms undergoing sexual reproduction, two haploid gametes fuse to form diploid zygote. The zygote then undergoes meiosis to produce haploid organism. 

So, at the time of fertilization, these haploid gametes fuse to form diploid zygote which undergoes meiotic divisions