2n gametes

It is important to note that, while knowledge of EBN and 2n gamete production allows for successful cross prediction most of the time, there are exceptions. Sometimes intra-EBN crosses fail and, at other times, inter-EBN crosses succeed even without the presence of 2n gametes. EBN is only one component of a complex system of pre- and post-zygotic interspecific crossing barriers (Masuelli and Camadro, 1997 Chen et al., 2004). 

Carputo, D., Barone, A., Frusciante, L. (2000a). 2n gametes in the potato essential ingredients for breeding and germplasm transfer. Theoretical and Applied Genetics, 101, 805-813. 

Leue, E. F. (1983). The use of haploids, 2n gametes, and the topiary mutant in the adaptation of wild Solanum germplasm and its ineorporation into Tuberosum, Vol. Ph.D., pp. 189. University of Wiseonsin-Madison,... 

Except for the gametes of sexually reproducing species, platyhelminths are generally diploid (2n) throughout their life cycles. However, a vast array of non-standard chromosome complements have been reported, including polyploid taxa, supernumerary chromosomes and aneuploids. 

Human gametes have 23 chromosomes (haploid chromosome number n = 23), while most somatic cells have 46 chromosomes (diploid chromosome number 2n = 46). 

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