As per the effects of mitosis, the fern sperm cells are in the 1n ploidy level.
The ploidy level of a cell makes reference to the number of chromosomes present in a cell during and after cellular division. When a cell has pairs of chromosomes it is considered to be diploid and is represented by the level of 2n. When, like in this case, the chromosomes are singular, it is haploid (1n).
Sperm is produced inside of the gametophyte of the fern. Specifically within a structure known as the antheridium. On the other hand, the egg production takes place within the archegonium.
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