Answer;
Sexually.
The organism describes above reproduces sexually.
Explanation;
This is attributed to the fact that it contains haploid gametes which means they have only one set of each chromosome.
During fertilization the male gametes and haploid gametes to form a diploid (two sets of each chromosome) zygote. This means the off springs will have diploid body cell or somatic cells after differentiation and the process of mitosis.